<?xml version='1.0' encoding='UTF-8'?><rss xmlns:atom="http://www.w3.org/2005/Atom" xmlns:openSearch="http://a9.com/-/spec/opensearchrss/1.0/" xmlns:blogger="http://schemas.google.com/blogger/2008" xmlns:georss="http://www.georss.org/georss" xmlns:gd="http://schemas.google.com/g/2005" xmlns:thr="http://purl.org/syndication/thread/1.0" version="2.0"><channel><atom:id>tag:blogger.com,1999:blog-3550204829234352390</atom:id><lastBuildDate>Mon, 08 Jun 2026 08:11:06 +0000</lastBuildDate><category>數學考題</category><category>數學錦囊</category><category>雜七雜八</category><category>程式設計</category><category>好書推薦</category><category>腦力激盪</category><category>電機電子</category><category>橋牌專欄</category><category>ROSA (Arduino)</category><category>Andy奇想</category><category>LEGO MINDSTORMS NXT</category><category>英語學習</category><category>學習心得</category><category>工作感想</category><category>桌遊好玩</category><category>商品評論</category><category>四格拼圖</category><category>研發管理</category><category>排列組合</category><category>社區管理</category><category>航海天文</category><category>Python 程式</category><category>行動裝置</category><category>ROBI 機器人</category><category>待解難題</category><category>其它機器人</category><category>Arduino</category><category>科學知識</category><category>Micro:bit</category><title>研發養成所 ( Bridan&amp;#39;s Blog - 4rdp, For R&amp;amp;D Person )</title><description></description><link>http://4rdp.blogspot.com/</link><managingEditor>noreply@blogger.com (Bridan)</managingEditor><generator>Blogger</generator><openSearch:totalResults>1536</openSearch:totalResults><openSearch:startIndex>1</openSearch:startIndex><openSearch:itemsPerPage>25</openSearch:itemsPerPage><item><guid isPermaLink="false">tag:blogger.com,1999:blog-3550204829234352390.post-4245699607517795267</guid><pubDate>Sun, 07 Jun 2026 00:00:00 +0000</pubDate><atom:updated>2026-06-07T08:00:00.113+08:00</atom:updated><category domain="http://www.blogger.com/atom/ns#">科學知識</category><title>粒子物理 (夸克 quark)</title><description>&lt;div class=&quot;separator&quot; style=&quot;clear: both; text-align: center;&quot;&gt;&lt;iframe allowfullscreen=&quot;&quot; class=&quot;BLOG_video_class&quot; height=&quot;266&quot; src=&quot;https://www.youtube.com/embed/Pm7Yob2tifI&quot; width=&quot;320&quot; youtube-src-id=&quot;Pm7Yob2tifI&quot;&gt;&lt;/iframe&gt;&lt;/div&gt;&lt;br /&gt;&lt;div&gt;粒子物理與化學、量子物理等領域知識有相關聯，因此引起我的興趣。&lt;/div&gt;&lt;span&gt;&lt;a name=&#39;more&#39;&gt;&lt;/a&gt;&lt;/span&gt;&lt;div&gt;&lt;br /&gt;&lt;/div&gt;&lt;div&gt;物理學已經進化到 夸克、前子 等新概念，這段影片我仍有很多部分看不懂，先記錄下來，希望未來能夠悟通。&lt;/div&gt;</description><link>http://4rdp.blogspot.com/2026/06/quark.html</link><author>noreply@blogger.com (Bridan)</author><media:thumbnail xmlns:media="http://search.yahoo.com/mrss/" url="https://img.youtube.com/vi/Pm7Yob2tifI/default.jpg" height="72" width="72"/><thr:total>0</thr:total></item><item><guid isPermaLink="false">tag:blogger.com,1999:blog-3550204829234352390.post-472531118536105339</guid><pubDate>Wed, 03 Jun 2026 00:00:00 +0000</pubDate><atom:updated>2026-06-03T08:00:00.136+08:00</atom:updated><category domain="http://www.blogger.com/atom/ns#">數學考題</category><title>訓練數學感 436 ─ 漱口水</title><description>&lt;div&gt;&lt;div class=&quot;separator&quot; style=&quot;clear: both; text-align: center;&quot;&gt;&lt;a href=&quot;https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjqQq1XyrQZoYh2C8UMjp1_gSOQri757QtnqPT7glDvT9-4m-965NApAOnTmBBHu05sHAA0NW55KBoT3SnKUNNuOC6ayURj_eEFT1uBJwnvEtgCLznyxs1K5SmMZw5F0RxYxcLA244Cl3IAGnAic4jVQooBgVZ-B9w-k0J91kBtTPtLzDc-DCv7vBM6X2_i/s1024/CM_500ml_clear_cap.webp&quot; imageanchor=&quot;1&quot; style=&quot;clear: left; float: left; margin-bottom: 1em; margin-right: 1em;&quot;&gt;&lt;img border=&quot;0&quot; data-original-height=&quot;1024&quot; data-original-width=&quot;1024&quot; height=&quot;320&quot; src=&quot;https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjqQq1XyrQZoYh2C8UMjp1_gSOQri757QtnqPT7glDvT9-4m-965NApAOnTmBBHu05sHAA0NW55KBoT3SnKUNNuOC6ayURj_eEFT1uBJwnvEtgCLznyxs1K5SmMZw5F0RxYxcLA244Cl3IAGnAic4jVQooBgVZ-B9w-k0J91kBtTPtLzDc-DCv7vBM6X2_i/s320/CM_500ml_clear_cap.webp&quot; width=&quot;320&quot; /&gt;&lt;/a&gt;&lt;/div&gt;&lt;br /&gt;某漱口水瓶上標示正確的使用方式：&lt;/div&gt;&lt;div&gt;一次的使用量 = 瓶蓋容量的 1/3。&lt;/div&gt;&lt;div&gt;&lt;br /&gt;&lt;/div&gt;&lt;div&gt;小瑋買了一瓶，但他誤把 1/3 看成 1/2。&lt;/div&gt;&lt;div&gt;他這樣錯誤地使用了 10 次，才發現搞錯了。&lt;/div&gt;&lt;div&gt;此時瓶內漱口水還剩下 原來的 3/4。&lt;/div&gt;&lt;div&gt;&lt;br /&gt;&lt;/div&gt;&lt;div&gt;問：&lt;/div&gt;&lt;div&gt;如果之後小瑋改成正確方式（一次用 1/3 瓶蓋）繼續使用，&lt;/div&gt;&lt;div&gt;還可以用幾次？&lt;/div&gt;&lt;div&gt;&lt;br /&gt;&lt;/div&gt;&lt;div&gt;難度&amp;nbsp;&lt;span style=&quot;font-family: &amp;quot;Trebuchet MS&amp;quot;, Trebuchet, Verdana, sans-serif; font-size: 16px;&quot;&gt;✩&lt;/span&gt;&lt;span style=&quot;font-family: &amp;quot;Trebuchet MS&amp;quot;, Trebuchet, Verdana, sans-serif; font-size: 16px;&quot;&gt;✩&lt;/span&gt;&lt;/div&gt;&lt;div&gt;&lt;span&gt;&lt;a name=&#39;more&#39;&gt;&lt;/a&gt;&lt;/span&gt;&lt;span style=&quot;font-family: &amp;quot;Trebuchet MS&amp;quot;, Trebuchet, Verdana, sans-serif; font-size: 16px;&quot;&gt;&lt;br /&gt;&lt;/span&gt;&lt;/div&gt;&lt;div&gt;&lt;span style=&quot;font-family: &amp;quot;Trebuchet MS&amp;quot;, Trebuchet, Verdana, sans-serif; font-size: 16px;&quot;&gt;前年有牙周病，刷牙難刷乾淨，有點牙疼，靠漱口水&lt;/span&gt;&lt;span style=&quot;font-family: &amp;quot;Trebuchet MS&amp;quot;, Trebuchet, Verdana, sans-serif; font-size: 16px;&quot;&gt;殺菌的功效解決。&lt;/span&gt;&lt;/div&gt;&lt;div&gt;&lt;span style=&quot;font-family: &amp;quot;Trebuchet MS&amp;quot;, Trebuchet, Verdana, sans-serif; font-size: 16px;&quot;&gt;&lt;br /&gt;&lt;/span&gt;&lt;/div&gt;&lt;div&gt;&lt;span style=&quot;font-family: &amp;quot;Trebuchet MS&amp;quot;, Trebuchet, Verdana, sans-serif; font-size: 16px;&quot;&gt;這題難度不高，小學高年級可能可以解出，畫圖後，就知道如何解題。&lt;/span&gt;&lt;/div&gt;</description><link>http://4rdp.blogspot.com/2026/06/436.html</link><author>noreply@blogger.com (Bridan)</author><media:thumbnail xmlns:media="http://search.yahoo.com/mrss/" url="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjqQq1XyrQZoYh2C8UMjp1_gSOQri757QtnqPT7glDvT9-4m-965NApAOnTmBBHu05sHAA0NW55KBoT3SnKUNNuOC6ayURj_eEFT1uBJwnvEtgCLznyxs1K5SmMZw5F0RxYxcLA244Cl3IAGnAic4jVQooBgVZ-B9w-k0J91kBtTPtLzDc-DCv7vBM6X2_i/s72-c/CM_500ml_clear_cap.webp" height="72" width="72"/><thr:total>0</thr:total></item><item><guid isPermaLink="false">tag:blogger.com,1999:blog-3550204829234352390.post-1732136554113570107</guid><pubDate>Sat, 30 May 2026 00:00:00 +0000</pubDate><atom:updated>2026-05-30T08:00:00.117+08:00</atom:updated><category domain="http://www.blogger.com/atom/ns#">數學錦囊</category><title>數學之美 52 ─ 三角函數 (無字證明)</title><description>&lt;div class=&quot;separator&quot; style=&quot;clear: both; text-align: center;&quot;&gt;&lt;a href=&quot;https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgKPRx5BDPBVTFa7LOpheC8DFds-9E5vzEDW3-zjATojLz-IHOcaXafyU91MmJqzfIjMhOaERKlP1Wfi9svS8EfCUrIW5uDgf3yUXIgIEw7zrm6aDpJ4WsKhAna9ErpRiBL2QMgjgRQS7ZYC8I5FKzXqTCOjizpXwKr4Dz90T23LXSoeTan3LO6wNYfSB6I/s960/662584345_1358230836351175_7193452684216101390_n.jpg&quot; imageanchor=&quot;1&quot; style=&quot;margin-left: 1em; margin-right: 1em;&quot;&gt;&lt;img border=&quot;0&quot; data-original-height=&quot;540&quot; data-original-width=&quot;960&quot; height=&quot;360&quot; src=&quot;https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgKPRx5BDPBVTFa7LOpheC8DFds-9E5vzEDW3-zjATojLz-IHOcaXafyU91MmJqzfIjMhOaERKlP1Wfi9svS8EfCUrIW5uDgf3yUXIgIEw7zrm6aDpJ4WsKhAna9ErpRiBL2QMgjgRQS7ZYC8I5FKzXqTCOjizpXwKr4Dz90T23LXSoeTan3LO6wNYfSB6I/w640-h360/662584345_1358230836351175_7193452684216101390_n.jpg&quot; width=&quot;640&quot; /&gt;&lt;/a&gt;&lt;/div&gt;&lt;span&gt;&lt;a name=&#39;more&#39;&gt;&lt;/a&gt;&lt;/span&gt;&lt;div class=&quot;separator&quot; style=&quot;clear: both; text-align: left;&quot;&gt;&lt;br /&gt;&lt;/div&gt;&lt;div class=&quot;separator&quot; style=&quot;clear: both; text-align: left;&quot;&gt;很喜歡這種不需過多文字說明的圖片，圖片來源&lt;a href=&quot;https://www.facebook.com/HFIMath/posts/pfbid0okEMeX9UU2hmC63TGos4CTXDpwPyhBNwdUkx9JiL1AP5cWfjnGvBbPjkv9izR21ql&quot; target=&quot;_blank&quot;&gt;趣學數學 HFIMath&lt;/a&gt;&lt;/div&gt;&lt;div class=&quot;separator&quot; style=&quot;clear: both; text-align: left;&quot;&gt;&lt;br /&gt;&lt;/div&gt;&lt;div class=&quot;separator&quot; style=&quot;clear: both; text-align: left;&quot;&gt;延伸閱讀&lt;/div&gt;&lt;div class=&quot;separator&quot; style=&quot;clear: both; text-align: left;&quot;&gt;&lt;a href=&quot;https://4rdp.blogspot.com/2015/10/blog-post.html?m=0&quot; target=&quot;_blank&quot;&gt;數學之美 3 ─ 圖解三角函數角和差&lt;/a&gt;&lt;/div&gt;&lt;div class=&quot;separator&quot; style=&quot;clear: both; text-align: center;&quot;&gt;&lt;br /&gt;&lt;/div&gt;&lt;br /&gt;</description><link>http://4rdp.blogspot.com/2026/05/52.html</link><author>noreply@blogger.com (Bridan)</author><media:thumbnail xmlns:media="http://search.yahoo.com/mrss/" url="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgKPRx5BDPBVTFa7LOpheC8DFds-9E5vzEDW3-zjATojLz-IHOcaXafyU91MmJqzfIjMhOaERKlP1Wfi9svS8EfCUrIW5uDgf3yUXIgIEw7zrm6aDpJ4WsKhAna9ErpRiBL2QMgjgRQS7ZYC8I5FKzXqTCOjizpXwKr4Dz90T23LXSoeTan3LO6wNYfSB6I/s72-w640-h360-c/662584345_1358230836351175_7193452684216101390_n.jpg" height="72" width="72"/><thr:total>0</thr:total></item><item><guid isPermaLink="false">tag:blogger.com,1999:blog-3550204829234352390.post-2109233369104554534</guid><pubDate>Tue, 26 May 2026 00:00:00 +0000</pubDate><atom:updated>2026-05-26T08:00:00.130+08:00</atom:updated><category domain="http://www.blogger.com/atom/ns#">雜七雜八</category><title>正確的溝通順序</title><description>&lt;div class=&quot;separator&quot; style=&quot;clear: both; text-align: center;&quot;&gt;&lt;iframe allowfullscreen=&quot;&quot; class=&quot;BLOG_video_class&quot; height=&quot;266&quot; src=&quot;https://www.youtube.com/embed/HfCQPt9t1Z8&quot; width=&quot;320&quot; youtube-src-id=&quot;HfCQPt9t1Z8&quot;&gt;&lt;/iframe&gt;&lt;/div&gt;&lt;div class=&quot;separator&quot; style=&quot;clear: both; text-align: center;&quot;&gt;&lt;br /&gt;&lt;/div&gt;&lt;span&gt;&lt;a name=&#39;more&#39;&gt;&lt;/a&gt;&lt;/span&gt;&lt;div class=&quot;separator&quot; style=&quot;clear: both; text-align: center;&quot;&gt;&lt;br /&gt;&lt;/div&gt;&lt;div class=&quot;separator&quot; style=&quot;clear: both; text-align: left;&quot;&gt;良好的溝通順序&amp;nbsp; &amp;nbsp;自身責任 &amp;gt; 解決方案 &amp;gt; 需求資源&lt;/div&gt;&lt;div class=&quot;separator&quot; style=&quot;clear: both; text-align: left;&quot;&gt;&lt;br /&gt;&lt;/div&gt;&lt;div class=&quot;separator&quot; style=&quot;clear: both; text-align: left;&quot;&gt;&lt;div class=&quot;separator&quot; style=&quot;clear: both;&quot;&gt;1. 處理情緒，使對方的理智上線&lt;/div&gt;&lt;div class=&quot;separator&quot; style=&quot;clear: both;&quot;&gt;2. 使用演繹法，先講明結論&lt;/div&gt;&lt;div class=&quot;separator&quot; style=&quot;clear: both;&quot;&gt;3. 給對方留台階，避免引起逆反效應&lt;/div&gt;&lt;/div&gt;&lt;div class=&quot;separator&quot; style=&quot;clear: both; text-align: left;&quot;&gt;&lt;br /&gt;&lt;/div&gt;&lt;div&gt;&lt;/div&gt;</description><link>http://4rdp.blogspot.com/2026/05/blog-post.html</link><author>noreply@blogger.com (Bridan)</author><media:thumbnail xmlns:media="http://search.yahoo.com/mrss/" url="https://img.youtube.com/vi/HfCQPt9t1Z8/default.jpg" height="72" width="72"/><thr:total>0</thr:total></item><item><guid isPermaLink="false">tag:blogger.com,1999:blog-3550204829234352390.post-4011884143852557511</guid><pubDate>Fri, 22 May 2026 00:00:00 +0000</pubDate><atom:updated>2026-05-22T08:00:00.232+08:00</atom:updated><category domain="http://www.blogger.com/atom/ns#">數學考題</category><title>訓練數學感 435 ─ 求面積</title><description>&lt;div class=&quot;separator&quot; style=&quot;clear: both; text-align: center;&quot;&gt;&lt;a href=&quot;https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg1Q5vSyCvhIR0w6qMLdEqrfI4bPPZSoKD6p5fxujJHZf7KEUo3pVv8lAI4Mgg1208QBNfrTuZ_uzbapeI465gaZajLPuICdw8Ii_I8eWDAkc9_4hraGSOA0SyAL7IMUE6xGSJOomgWomjYlcIRuMzblT_tAXy8_-8NNOxcf1rMa80XmFbeFJxKYlmT9Ccv/s526/678928733_872407619202138_6248121033592329266_n.jpg&quot; imageanchor=&quot;1&quot; style=&quot;clear: left; float: left; margin-bottom: 1em; margin-right: 1em;&quot;&gt;&lt;img border=&quot;0&quot; data-original-height=&quot;421&quot; data-original-width=&quot;526&quot; height=&quot;256&quot; src=&quot;https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg1Q5vSyCvhIR0w6qMLdEqrfI4bPPZSoKD6p5fxujJHZf7KEUo3pVv8lAI4Mgg1208QBNfrTuZ_uzbapeI465gaZajLPuICdw8Ii_I8eWDAkc9_4hraGSOA0SyAL7IMUE6xGSJOomgWomjYlcIRuMzblT_tAXy8_-8NNOxcf1rMa80XmFbeFJxKYlmT9Ccv/s320/678928733_872407619202138_6248121033592329266_n.jpg&quot; width=&quot;320&quot; /&gt;&lt;/a&gt;&lt;/div&gt;如左圖，兩個長方形面積相差 20 平方單位，F 是 線段 AB 的中點，求橙色部分面積大小。&lt;div&gt;&lt;br /&gt;&lt;/div&gt;&lt;div&gt;難度&amp;nbsp;&lt;span style=&quot;font-size: 16px;&quot;&gt;✩&lt;/span&gt;&lt;span style=&quot;font-size: 16px;&quot;&gt;✩&lt;/span&gt;&lt;/div&gt;&lt;div&gt;&lt;span&gt;&lt;a name=&#39;more&#39;&gt;&lt;/a&gt;&lt;/span&gt;&lt;span style=&quot;font-size: 16px;&quot;&gt;&lt;br /&gt;&lt;/span&gt;&lt;/div&gt;&lt;div&gt;解題過程雖然可以用小學生解法，不過我覺得太難發現三角形之間的關聯，因此定為國中學生的難度。&lt;/div&gt;</description><link>http://4rdp.blogspot.com/2026/05/435.html</link><author>noreply@blogger.com (Bridan)</author><media:thumbnail xmlns:media="http://search.yahoo.com/mrss/" url="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg1Q5vSyCvhIR0w6qMLdEqrfI4bPPZSoKD6p5fxujJHZf7KEUo3pVv8lAI4Mgg1208QBNfrTuZ_uzbapeI465gaZajLPuICdw8Ii_I8eWDAkc9_4hraGSOA0SyAL7IMUE6xGSJOomgWomjYlcIRuMzblT_tAXy8_-8NNOxcf1rMa80XmFbeFJxKYlmT9Ccv/s72-c/678928733_872407619202138_6248121033592329266_n.jpg" height="72" width="72"/><thr:total>0</thr:total></item><item><guid isPermaLink="false">tag:blogger.com,1999:blog-3550204829234352390.post-1576426418191837612</guid><pubDate>Mon, 18 May 2026 00:00:00 +0000</pubDate><atom:updated>2026-05-18T08:00:00.193+08:00</atom:updated><category domain="http://www.blogger.com/atom/ns#">數學錦囊</category><title>數學之美 51 ─ 多項式求解</title><description>&lt;div class=&quot;separator&quot; style=&quot;clear: both; text-align: center;&quot;&gt;&lt;iframe allowfullscreen=&quot;&quot; class=&quot;BLOG_video_class&quot; height=&quot;266&quot; src=&quot;https://www.youtube.com/embed/s4hqIBy3ChY&quot; width=&quot;320&quot; youtube-src-id=&quot;s4hqIBy3ChY&quot;&gt;&lt;/iframe&gt;&lt;/div&gt;&lt;span&gt;&lt;br /&gt;&lt;/span&gt;&lt;div&gt;&lt;span&gt;&lt;a name=&#39;more&#39;&gt;&lt;/a&gt;&lt;/span&gt;&lt;span&gt;&lt;br /&gt;&lt;/span&gt;&lt;/div&gt;&lt;div&gt;&lt;span&gt;竟然有人把數學解題說明製作成 Rap 影片，佩服！&lt;/span&gt;&lt;/div&gt;&lt;div&gt;&lt;span&gt;&lt;br /&gt;&lt;/span&gt;&lt;/div&gt;&lt;div&gt;&lt;span&gt;以往我都是展開多項式來解題，以後會注意係數之間關連性，或是變換成 (t+1)(t-1) 型式，這樣算題目就快很多了。&lt;/span&gt;&lt;/div&gt;</description><link>http://4rdp.blogspot.com/2026/05/51.html</link><author>noreply@blogger.com (Bridan)</author><media:thumbnail xmlns:media="http://search.yahoo.com/mrss/" url="https://img.youtube.com/vi/s4hqIBy3ChY/default.jpg" height="72" width="72"/><thr:total>0</thr:total></item><item><guid isPermaLink="false">tag:blogger.com,1999:blog-3550204829234352390.post-86822951501962764</guid><pubDate>Thu, 14 May 2026 00:00:00 +0000</pubDate><atom:updated>2026-05-14T08:00:00.122+08:00</atom:updated><category domain="http://www.blogger.com/atom/ns#">數學錦囊</category><category domain="http://www.blogger.com/atom/ns#">腦力激盪</category><title>解繩技巧 3</title><description>&lt;div class=&quot;separator&quot; style=&quot;clear: both; text-align: center;&quot;&gt;&lt;iframe allowfullscreen=&quot;&quot; class=&quot;BLOG_video_class&quot; height=&quot;266&quot; src=&quot;https://www.youtube.com/embed/cu4PX2hca-E&quot; width=&quot;320&quot; youtube-src-id=&quot;cu4PX2hca-E&quot;&gt;&lt;/iframe&gt;&lt;/div&gt;&lt;br /&gt;&lt;span&gt;&lt;a name=&#39;more&#39;&gt;&lt;/a&gt;&lt;/span&gt;&lt;div&gt;&lt;br /&gt;&lt;/div&gt;&lt;div&gt;這裡雖然沒有繩子，但是那鐵絲是繩子的同值物品，不過多了剛性特質。&lt;/div&gt;</description><link>http://4rdp.blogspot.com/2026/05/3.html</link><author>noreply@blogger.com (Bridan)</author><media:thumbnail xmlns:media="http://search.yahoo.com/mrss/" url="https://img.youtube.com/vi/cu4PX2hca-E/default.jpg" height="72" width="72"/><thr:total>0</thr:total></item><item><guid isPermaLink="false">tag:blogger.com,1999:blog-3550204829234352390.post-7958335998639336117</guid><pubDate>Sun, 10 May 2026 00:00:00 +0000</pubDate><atom:updated>2026-05-10T08:00:00.116+08:00</atom:updated><category domain="http://www.blogger.com/atom/ns#">數學考題</category><title>訓練數學感 434 ─ 求三角形面積</title><description>&lt;div class=&quot;separator&quot; style=&quot;clear: both; text-align: center;&quot;&gt;&lt;a href=&quot;https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjVXlDSsWZeUn3gaGgDKM5v-I_Ruh_Ziae2ZJZHHG0y2YYL1NJLhLJiiq9pa6XXoe4LGMnTq_F1aoAlJEnYdltAqnbkVoP2Wtf-nAiJUmZtny8rixd7AL44LuC_g_KstfadhJf03hXt0q1KpwB_rgJVY8ajbfubkTowHpswp3qGEbxz-ghGglmUIjEDijYx/s590/647280877_2323649288062332_6491672471868552738_n.jpg&quot; style=&quot;clear: left; float: left; margin-bottom: 1em; margin-right: 1em;&quot;&gt;&lt;img border=&quot;0&quot; data-original-height=&quot;508&quot; data-original-width=&quot;590&quot; height=&quot;276&quot; src=&quot;https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjVXlDSsWZeUn3gaGgDKM5v-I_Ruh_Ziae2ZJZHHG0y2YYL1NJLhLJiiq9pa6XXoe4LGMnTq_F1aoAlJEnYdltAqnbkVoP2Wtf-nAiJUmZtny8rixd7AL44LuC_g_KstfadhJf03hXt0q1KpwB_rgJVY8ajbfubkTowHpswp3qGEbxz-ghGglmUIjEDijYx/s320/647280877_2323649288062332_6491672471868552738_n.jpg&quot; width=&quot;320&quot; /&gt;&lt;/a&gt;&lt;/div&gt;三個大小不同的正三角形套疊，最裡面最小的正方形面積為 3 cm&lt;span id=&quot;docs-internal-guid-bb500df1-7fff-0979-fcbe-7b992b265f1d&quot;&gt;&lt;span style=&quot;background-color: white; font-family: Arial, sans-serif; font-size: 12pt; font-variant: normal; vertical-align: baseline; white-space: pre-wrap;&quot;&gt;²&lt;/span&gt;&lt;/span&gt;，求最外面&amp;nbsp;&lt;span id=&quot;docs-internal-guid-0503d8d6-7fff-4ad1-ae25-a4b69f3b08c6&quot;&gt;&lt;span style=&quot;font-family: Arial, sans-serif; font-size: 12pt; font-variant: normal; vertical-align: baseline; white-space: pre-wrap;&quot;&gt;∆ &lt;/span&gt;&lt;/span&gt;ABC 面積為多少？&lt;div&gt;&lt;br /&gt;&lt;/div&gt;&lt;div&gt;難度&amp;nbsp;&lt;span style=&quot;font-size: 16px;&quot;&gt;✩&lt;/span&gt;&lt;span style=&quot;font-size: 16px;&quot;&gt;✩&lt;/span&gt;&lt;/div&gt;&lt;div&gt;&lt;span&gt;&lt;a name=&#39;more&#39;&gt;&lt;/a&gt;&lt;/span&gt;&lt;span style=&quot;font-size: 16px;&quot;&gt;&lt;br /&gt;&lt;/span&gt;&lt;/div&gt;&lt;div&gt;&lt;span style=&quot;font-size: 16px;&quot;&gt;這題在 FB 看到，雖然說題目設定為國中程度，不過懂比例原理的國小生也是能解，差在小學生還不懂開根號。&lt;/span&gt;&lt;/div&gt;</description><link>http://4rdp.blogspot.com/2026/05/434.html</link><author>noreply@blogger.com (Bridan)</author><media:thumbnail xmlns:media="http://search.yahoo.com/mrss/" url="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjVXlDSsWZeUn3gaGgDKM5v-I_Ruh_Ziae2ZJZHHG0y2YYL1NJLhLJiiq9pa6XXoe4LGMnTq_F1aoAlJEnYdltAqnbkVoP2Wtf-nAiJUmZtny8rixd7AL44LuC_g_KstfadhJf03hXt0q1KpwB_rgJVY8ajbfubkTowHpswp3qGEbxz-ghGglmUIjEDijYx/s72-c/647280877_2323649288062332_6491672471868552738_n.jpg" height="72" width="72"/><thr:total>0</thr:total></item><item><guid isPermaLink="false">tag:blogger.com,1999:blog-3550204829234352390.post-2781604557673495524</guid><pubDate>Wed, 06 May 2026 00:00:00 +0000</pubDate><atom:updated>2026-05-06T08:00:00.121+08:00</atom:updated><category domain="http://www.blogger.com/atom/ns#">數學錦囊</category><title>數學之美 50 ─ 拉格朗日插值法 (Lagrange polynomial)</title><description>&lt;p&gt;&lt;/p&gt;&lt;div class=&quot;separator&quot; style=&quot;clear: both; text-align: center;&quot;&gt;&lt;iframe allowfullscreen=&quot;&quot; class=&quot;BLOG_video_class&quot; height=&quot;266&quot; src=&quot;https://www.youtube.com/embed/c_iDAcDTuRM&quot; width=&quot;320&quot; youtube-src-id=&quot;c_iDAcDTuRM&quot;&gt;&lt;/iframe&gt;&lt;/div&gt;&lt;div class=&quot;separator&quot; style=&quot;clear: both; text-align: center;&quot;&gt;&lt;br /&gt;&lt;/div&gt;&lt;div class=&quot;separator&quot; style=&quot;clear: both; text-align: left;&quot;&gt;已知 $f(1) = 3$，$f(2) = 5$，$f(3) = 7$，求 $f(x)$ 二次多項式&lt;/div&gt;&lt;div class=&quot;separator&quot; style=&quot;clear: both; text-align: left;&quot;&gt;&lt;br /&gt;&lt;/div&gt;&lt;div class=&quot;separator&quot; style=&quot;clear: both; text-align: left;&quot;&gt;不過求 $f(x)$ 之前先求 $g(x)$、$h(x)$、$k(x)$&lt;/div&gt;&lt;div class=&quot;separator&quot; style=&quot;clear: both; text-align: left;&quot;&gt;令 $g(1) = 1$，$g(2) = 0$，$g(3) = 0$，&lt;/div&gt;&lt;div class=&quot;separator&quot; style=&quot;clear: both; text-align: left;&quot;&gt;得 $g(x)=\frac{(x-2)(x-3)}{(1-2)(1-3)}$&lt;/div&gt;&lt;p&gt;&lt;/p&gt;&lt;div class=&quot;separator&quot; style=&quot;clear: both;&quot;&gt;令 $h(1) = 0$，$h(2) = 1$，$h(3) = 0$，&lt;/div&gt;&lt;div class=&quot;separator&quot; style=&quot;clear: both;&quot;&gt;&lt;div class=&quot;separator&quot; style=&quot;clear: both;&quot;&gt;得 $h(x)=\frac{(x-1)(x-3)}{(2-1)(2-3)}$&lt;/div&gt;&lt;div class=&quot;separator&quot; style=&quot;clear: both;&quot;&gt;&lt;br /&gt;&lt;/div&gt;&lt;/div&gt;&lt;div class=&quot;separator&quot; style=&quot;clear: both;&quot;&gt;再令 $k(1) = 0$，$k(2) = 0$，$k(3) = 1$，&lt;/div&gt;&lt;div class=&quot;separator&quot; style=&quot;clear: both;&quot;&gt;&lt;div class=&quot;separator&quot; style=&quot;clear: both;&quot;&gt;&lt;div class=&quot;separator&quot; style=&quot;clear: both;&quot;&gt;得 $k(x)=\frac{(x-1)(x-2)}{(3-1)(3-2)}$&lt;/div&gt;&lt;div class=&quot;separator&quot; style=&quot;clear: both;&quot;&gt;&lt;br /&gt;&lt;/div&gt;&lt;div class=&quot;separator&quot; style=&quot;clear: both;&quot;&gt;最後 $f(x) = 3g(x) + 5h(x) + 7k(x)$&lt;/div&gt;&lt;/div&gt;&lt;/div&gt;&lt;p&gt;&lt;span&gt;&lt;/span&gt;&lt;/p&gt;&lt;a name=&#39;more&#39;&gt;&lt;/a&gt;&lt;div class=&quot;separator&quot; style=&quot;clear: both; text-align: center;&quot;&gt;&lt;br /&gt;&lt;/div&gt;&lt;div class=&quot;separator&quot; style=&quot;clear: both; text-align: left;&quot;&gt;拉格朗日插值法是不用解 $f(x) = ax^{2} + bx + c$ 係數 $abc$，就可以把二次多項式列式出來的方法。&lt;/div&gt;&lt;div class=&quot;separator&quot; style=&quot;clear: both; text-align: left;&quot;&gt;&lt;br /&gt;&lt;/div&gt;&lt;div class=&quot;separator&quot; style=&quot;clear: both; text-align: left;&quot;&gt;以往我是採 Curve fitting，求出係數後，該多項式就可以直接使用，找時間算一下拉格朗日插值法的多項式最終係數是不是和 Curve fitting 一樣。&lt;/div&gt;&lt;p&gt;&lt;/p&gt;</description><link>http://4rdp.blogspot.com/2026/05/50-lagrange-polynomial.html</link><author>noreply@blogger.com (Bridan)</author><media:thumbnail xmlns:media="http://search.yahoo.com/mrss/" url="https://img.youtube.com/vi/c_iDAcDTuRM/default.jpg" height="72" width="72"/><thr:total>0</thr:total></item><item><guid isPermaLink="false">tag:blogger.com,1999:blog-3550204829234352390.post-2905651287073230014</guid><pubDate>Sat, 02 May 2026 00:00:00 +0000</pubDate><atom:updated>2026-05-02T08:00:00.119+08:00</atom:updated><category domain="http://www.blogger.com/atom/ns#">科學知識</category><title>新 119 號化學元素</title><description>&lt;div class=&quot;separator&quot; style=&quot;clear: both; text-align: center;&quot;&gt;&lt;iframe allowfullscreen=&quot;&quot; class=&quot;BLOG_video_class&quot; height=&quot;266&quot; src=&quot;https://www.youtube.com/embed/e8cv6jT5Omo&quot; width=&quot;320&quot; youtube-src-id=&quot;e8cv6jT5Omo&quot;&gt;&lt;/iframe&gt;&lt;/div&gt;&lt;br /&gt;&lt;span&gt;&lt;a name=&#39;more&#39;&gt;&lt;/a&gt;&lt;br /&gt;&lt;/span&gt;&lt;div&gt;&lt;span&gt;化學是我二十歲前喜愛的學科之一，以前一直不能理解帶正電的質子為什麼能聚合在原子核，而不會質子同正電荷互斥炸裂，&lt;/span&gt;看過影片後了解中子能提供額外強核力吸引質子與中子相合在一起，一切化學元素特性取決質子、中子、電子數量組合，紀錄這影片後，才知道新化學元素很難再被發現，第 119 號元素可能我這輩子不會被發現。&lt;/div&gt;&lt;div&gt;&lt;br /&gt;&lt;/div&gt;</description><link>http://4rdp.blogspot.com/2026/05/119.html</link><author>noreply@blogger.com (Bridan)</author><media:thumbnail xmlns:media="http://search.yahoo.com/mrss/" url="https://img.youtube.com/vi/e8cv6jT5Omo/default.jpg" height="72" width="72"/><thr:total>0</thr:total></item><item><guid isPermaLink="false">tag:blogger.com,1999:blog-3550204829234352390.post-4085544437239289874</guid><pubDate>Tue, 28 Apr 2026 00:00:00 +0000</pubDate><atom:updated>2026-04-28T08:00:00.114+08:00</atom:updated><category domain="http://www.blogger.com/atom/ns#">數學考題</category><title>訓練數學感 433 ─ 求面積 S</title><description>&lt;div class=&quot;separator&quot; style=&quot;clear: both; text-align: center;&quot;&gt;&lt;a href=&quot;https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgUz2xAFJhHEYsXbGGDHaEA7fzBTxmbBVWWrm_8ZKtM1uUSHnLSOhZtdYdTAfHm6d977CMzdER6uczCe04kIyYBtIbYT7BTZJaEo9UNmW6CVBFbPWP5A3s_k8ZQ8-a0TpCZPsqzETS8LI_V0ZhmUXkzSExEkBpg59ePIg9wKkCw7YH3dmZzOHsWCf362Uvz/s358/649708074_10164644195998669_5072815692560230968_n.jpg&quot; imageanchor=&quot;1&quot; style=&quot;clear: left; float: left; margin-bottom: 1em; margin-right: 1em;&quot;&gt;&lt;img border=&quot;0&quot; data-original-height=&quot;341&quot; data-original-width=&quot;358&quot; height=&quot;305&quot; src=&quot;https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgUz2xAFJhHEYsXbGGDHaEA7fzBTxmbBVWWrm_8ZKtM1uUSHnLSOhZtdYdTAfHm6d977CMzdER6uczCe04kIyYBtIbYT7BTZJaEo9UNmW6CVBFbPWP5A3s_k8ZQ8-a0TpCZPsqzETS8LI_V0ZhmUXkzSExEkBpg59ePIg9wKkCw7YH3dmZzOHsWCf362Uvz/s320/649708074_10164644195998669_5072815692560230968_n.jpg&quot; width=&quot;320&quot; /&gt;&lt;/a&gt;&lt;/div&gt;如左圖所示，最外面為一個正方形，分別由四個長方形共同組合而成，面積分別為 10, 20, 30, 40 平方單位，試求中間小正方形面積為多少？&lt;div&gt;&lt;br /&gt;&lt;/div&gt;&lt;div&gt;難度&amp;nbsp;&lt;span style=&quot;font-size: 16px;&quot;&gt;✩&lt;/span&gt;&lt;/div&gt;&lt;div&gt;&lt;span&gt;&lt;a name=&#39;more&#39;&gt;&lt;/a&gt;&lt;/span&gt;&lt;span style=&quot;font-size: 16px;&quot;&gt;&lt;br /&gt;&lt;/span&gt;&lt;/div&gt;&lt;div&gt;&lt;span style=&quot;font-size: 16px;&quot;&gt;這一題小學高年級應該會解。&lt;/span&gt;&lt;/div&gt;</description><link>http://4rdp.blogspot.com/2026/04/433-s.html</link><author>noreply@blogger.com (Bridan)</author><media:thumbnail xmlns:media="http://search.yahoo.com/mrss/" url="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgUz2xAFJhHEYsXbGGDHaEA7fzBTxmbBVWWrm_8ZKtM1uUSHnLSOhZtdYdTAfHm6d977CMzdER6uczCe04kIyYBtIbYT7BTZJaEo9UNmW6CVBFbPWP5A3s_k8ZQ8-a0TpCZPsqzETS8LI_V0ZhmUXkzSExEkBpg59ePIg9wKkCw7YH3dmZzOHsWCf362Uvz/s72-c/649708074_10164644195998669_5072815692560230968_n.jpg" height="72" width="72"/><thr:total>0</thr:total></item><item><guid isPermaLink="false">tag:blogger.com,1999:blog-3550204829234352390.post-9085374989249597291</guid><pubDate>Fri, 24 Apr 2026 00:00:00 +0000</pubDate><atom:updated>2026-04-24T08:00:00.117+08:00</atom:updated><category domain="http://www.blogger.com/atom/ns#">數學錦囊</category><title>數學之美 49 ─ 九點圓 (Euler&#39;s Circle)</title><description>&lt;div class=&quot;separator&quot; style=&quot;clear: both; text-align: center;&quot;&gt;&lt;a href=&quot;https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiLJXeVDrQG5pfDfXPzP16e3Lck3N7-Qz5ZaqgoyePc3gI_T6HsEiT9h5GbGaMlNUEdzD4XMbn_vV1jvLb7R1AUwu0sQcGeyzjJUmfP3-yPehQ1XvXamzRqpnROsJ9WKnyf9rhWc5iHt_dROZ9V5h8nGAb6WNrep-pEqn4XFxuWlFyjx5ISvN7MkEM4NTmK/s1474/39b5ecad371c2afb5b74e2fdbe3c717ea5ddecb1.jpg&quot; imageanchor=&quot;1&quot; style=&quot;margin-left: 1em; margin-right: 1em;&quot;&gt;&lt;img border=&quot;0&quot; data-original-height=&quot;1000&quot; data-original-width=&quot;1474&quot; height=&quot;434&quot; src=&quot;https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiLJXeVDrQG5pfDfXPzP16e3Lck3N7-Qz5ZaqgoyePc3gI_T6HsEiT9h5GbGaMlNUEdzD4XMbn_vV1jvLb7R1AUwu0sQcGeyzjJUmfP3-yPehQ1XvXamzRqpnROsJ9WKnyf9rhWc5iHt_dROZ9V5h8nGAb6WNrep-pEqn4XFxuWlFyjx5ISvN7MkEM4NTmK/w640-h434/39b5ecad371c2afb5b74e2fdbe3c717ea5ddecb1.jpg&quot; width=&quot;640&quot; /&gt;&lt;/a&gt;&lt;/div&gt;&lt;div class=&quot;separator&quot; style=&quot;clear: both; text-align: center;&quot;&gt;圖片來自 &lt;a href=&quot;https://family-free-work-learning.com/geometry-temple-euler/?fbclid=IwY2xjawP3VAJleHRuA2FlbQIxMABicmlkETF0ZDNkbjVNRFRLSkJEdlkzc3J0YwZhcHBfaWQQMjIyMDM5MTc4ODIwMDg5MgABHhraW0VdDlcWw9s-BaJ8kLcPdFB0lahslXxNcd268ug2U8tA_ZXTvW4eRi8E_aem_5YUQlAEZqqykpXADJAzqrQ&quot; target=&quot;_blank&quot;&gt;智匯雲端數位教育行&lt;/a&gt;&lt;/div&gt;&lt;div class=&quot;separator&quot; style=&quot;clear: both; text-align: center;&quot;&gt;&lt;br /&gt;&lt;/div&gt;&lt;div class=&quot;separator&quot; style=&quot;clear: both; text-align: left;&quot;&gt;在平面中，對任意三角形，其三邊的中點、三高的垂足、三頂點到垂心的三條線段中點，必然共圓。&lt;/div&gt;&lt;span&gt;&lt;a name=&#39;more&#39;&gt;&lt;/a&gt;&lt;/span&gt;&lt;div class=&quot;separator&quot; style=&quot;clear: both; text-align: center;&quot;&gt;&lt;br /&gt;&lt;/div&gt;&lt;div class=&quot;separator&quot; style=&quot;clear: both; text-align: left;&quot;&gt;智匯雲端數位教育行部落格有一篇九點圓的文章，涉及費爾巴哈定理，有興趣的人可以進一步查看證明過程。&lt;/div&gt;&lt;br /&gt;</description><link>http://4rdp.blogspot.com/2026/04/49-eulers-circle.html</link><author>noreply@blogger.com (Bridan)</author><media:thumbnail xmlns:media="http://search.yahoo.com/mrss/" url="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiLJXeVDrQG5pfDfXPzP16e3Lck3N7-Qz5ZaqgoyePc3gI_T6HsEiT9h5GbGaMlNUEdzD4XMbn_vV1jvLb7R1AUwu0sQcGeyzjJUmfP3-yPehQ1XvXamzRqpnROsJ9WKnyf9rhWc5iHt_dROZ9V5h8nGAb6WNrep-pEqn4XFxuWlFyjx5ISvN7MkEM4NTmK/s72-w640-h434-c/39b5ecad371c2afb5b74e2fdbe3c717ea5ddecb1.jpg" height="72" width="72"/><thr:total>0</thr:total></item><item><guid isPermaLink="false">tag:blogger.com,1999:blog-3550204829234352390.post-7194439868179052030</guid><pubDate>Mon, 20 Apr 2026 00:00:00 +0000</pubDate><atom:updated>2026-04-20T08:00:00.124+08:00</atom:updated><category domain="http://www.blogger.com/atom/ns#">科學知識</category><title>皮蛋怎麼來？</title><description>&lt;div class=&quot;separator&quot; style=&quot;clear: both; text-align: center;&quot;&gt;&lt;iframe allowfullscreen=&quot;&quot; class=&quot;BLOG_video_class&quot; height=&quot;266&quot; src=&quot;https://www.youtube.com/embed/ZoKZfYXRMWk&quot; width=&quot;320&quot; youtube-src-id=&quot;ZoKZfYXRMWk&quot;&gt;&lt;/iframe&gt;&lt;/div&gt;&lt;br /&gt;&lt;span&gt;&lt;a name=&#39;more&#39;&gt;&lt;/a&gt;&lt;/span&gt;&lt;div&gt;&lt;br /&gt;&lt;/div&gt;&lt;div&gt;皮蛋不是我喜愛的食物，小時候更不敢吃這黑黑臭臭的蛋，更難以理解怎樣製作出皮蛋，這部影片補足皮蛋相關知識。&lt;/div&gt;</description><link>http://4rdp.blogspot.com/2026/04/blog-post_20.html</link><author>noreply@blogger.com (Bridan)</author><media:thumbnail xmlns:media="http://search.yahoo.com/mrss/" url="https://img.youtube.com/vi/ZoKZfYXRMWk/default.jpg" height="72" width="72"/><thr:total>0</thr:total></item><item><guid isPermaLink="false">tag:blogger.com,1999:blog-3550204829234352390.post-7426847906614899654</guid><pubDate>Thu, 16 Apr 2026 00:00:00 +0000</pubDate><atom:updated>2026-04-16T08:00:00.121+08:00</atom:updated><category domain="http://www.blogger.com/atom/ns#">數學考題</category><title>訓練數學感 432 ─ 求面積</title><description>&lt;div class=&quot;separator&quot; style=&quot;clear: both; text-align: center;&quot;&gt;&lt;a href=&quot;https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiSdr4nNEGU3WHWGXmDmdHmiehpIJB-_a3vdRW88mjQhtIZ62ZWWONT_QcCHUJ4qRjcYbE3qgGx9IH8xgA8LcvSsAcGBsoE8RaOB6rgGe7PlY-08P-cSVu8ddsVTtlJkPrW5cQryPPzQRxe0q4M3vugDlkWE4UMo2BUgGhhMtGGZZFAns89UIm7K0WRlUjt/s298/%E8%9E%A2%E5%B9%95%E6%93%B7%E5%8F%96%E7%95%AB%E9%9D%A2%202026-03-20%20155816.png&quot; imageanchor=&quot;1&quot; style=&quot;clear: left; float: left; margin-bottom: 1em; margin-right: 1em;&quot;&gt;&lt;img border=&quot;0&quot; data-original-height=&quot;219&quot; data-original-width=&quot;298&quot; height=&quot;219&quot; src=&quot;https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiSdr4nNEGU3WHWGXmDmdHmiehpIJB-_a3vdRW88mjQhtIZ62ZWWONT_QcCHUJ4qRjcYbE3qgGx9IH8xgA8LcvSsAcGBsoE8RaOB6rgGe7PlY-08P-cSVu8ddsVTtlJkPrW5cQryPPzQRxe0q4M3vugDlkWE4UMo2BUgGhhMtGGZZFAns89UIm7K0WRlUjt/s1600/%E8%9E%A2%E5%B9%95%E6%93%B7%E5%8F%96%E7%95%AB%E9%9D%A2%202026-03-20%20155816.png&quot; width=&quot;298&quot; /&gt;&lt;/a&gt;&lt;/div&gt;如左圖所示，求陰影部分的面積。&lt;div&gt;&lt;br /&gt;&lt;/div&gt;&lt;div&gt;&lt;span face=&quot;&amp;quot;Trebuchet MS&amp;quot;, Trebuchet, Verdana, sans-serif&quot; style=&quot;font-family: &amp;quot;Trebuchet MS&amp;quot;, Trebuchet, Verdana, sans-serif; font-size: 16px;&quot;&gt;難度&amp;nbsp;&lt;/span&gt;&lt;span face=&quot;&amp;quot;Trebuchet MS&amp;quot;, Trebuchet, Verdana, sans-serif&quot; style=&quot;font-family: &amp;quot;Trebuchet MS&amp;quot;, Trebuchet, Verdana, sans-serif; font-size: 16px;&quot;&gt;✩&lt;/span&gt;&lt;/div&gt;&lt;div&gt;&lt;span&gt;&lt;a name=&#39;more&#39;&gt;&lt;/a&gt;&lt;/span&gt;&lt;span face=&quot;&amp;quot;Trebuchet MS&amp;quot;, Trebuchet, Verdana, sans-serif&quot; style=&quot;font-family: &amp;quot;Trebuchet MS&amp;quot;, Trebuchet, Verdana, sans-serif; font-size: 16px;&quot;&gt;&lt;br /&gt;&lt;/span&gt;&lt;/div&gt;&lt;div&gt;&lt;span face=&quot;&amp;quot;Trebuchet MS&amp;quot;, Trebuchet, Verdana, sans-serif&quot; style=&quot;font-family: &amp;quot;Trebuchet MS&amp;quot;, Trebuchet, Verdana, sans-serif; font-size: 16px;&quot;&gt;這題不難，小學生可解，還有一個姊妹題&amp;nbsp;&lt;/span&gt;&lt;/div&gt;&lt;div&gt;&lt;span face=&quot;&amp;quot;Trebuchet MS&amp;quot;, Trebuchet, Verdana, sans-serif&quot;&gt;&lt;span style=&quot;font-family: Trebuchet MS, Trebuchet, Verdana, sans-serif;&quot;&gt;&lt;a href=&quot;https://4rdp.blogspot.com/2022/06/324.html?m=0&quot; target=&quot;_blank&quot;&gt;訓練數學感 324 ─ 求陰影面積&lt;/a&gt;。&lt;/span&gt;&lt;/span&gt;&lt;/div&gt;</description><link>http://4rdp.blogspot.com/2026/04/432.html</link><author>noreply@blogger.com (Bridan)</author><media:thumbnail xmlns:media="http://search.yahoo.com/mrss/" url="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiSdr4nNEGU3WHWGXmDmdHmiehpIJB-_a3vdRW88mjQhtIZ62ZWWONT_QcCHUJ4qRjcYbE3qgGx9IH8xgA8LcvSsAcGBsoE8RaOB6rgGe7PlY-08P-cSVu8ddsVTtlJkPrW5cQryPPzQRxe0q4M3vugDlkWE4UMo2BUgGhhMtGGZZFAns89UIm7K0WRlUjt/s72-c/%E8%9E%A2%E5%B9%95%E6%93%B7%E5%8F%96%E7%95%AB%E9%9D%A2%202026-03-20%20155816.png" height="72" width="72"/><thr:total>4</thr:total></item><item><guid isPermaLink="false">tag:blogger.com,1999:blog-3550204829234352390.post-6030156394292037323</guid><pubDate>Sun, 12 Apr 2026 00:00:00 +0000</pubDate><atom:updated>2026-04-12T08:00:00.117+08:00</atom:updated><category domain="http://www.blogger.com/atom/ns#">數學錦囊</category><title>直線轉化成圓弧運動的機構</title><description>&lt;iframe allow=&quot;autoplay; clipboard-write; encrypted-media; picture-in-picture; web-share&quot; allowfullscreen=&quot;true&quot; frameborder=&quot;0&quot; height=&quot;476&quot; scrolling=&quot;no&quot; src=&quot;https://www.facebook.com/plugins/video.php?height=476&amp;amp;href=https%3A%2F%2Fwww.facebook.com%2Freel%2F3187178324797261%2F&amp;amp;show_text=false&amp;amp;width=267&amp;amp;t=0&quot; style=&quot;border: none; overflow: hidden;&quot; width=&quot;267&quot;&gt;&lt;/iframe&gt;&lt;div&gt;&lt;br /&gt;&lt;/div&gt;&lt;div&gt;這部影片提供直線轉化成圓弧運動的機構，其實它充滿數學味道。&lt;br /&gt;&lt;span&gt;&lt;a name=&#39;more&#39;&gt;&lt;/a&gt;&lt;/span&gt;&lt;div&gt;&lt;br /&gt;&lt;/div&gt;&lt;div&gt;也許未來某天會用到這個機構，先存下這個連結。&lt;/div&gt;&lt;div&gt;&lt;br /&gt;&lt;/div&gt;&lt;div&gt;延伸閱讀&lt;/div&gt;&lt;div&gt;&lt;a href=&quot;https://4rdp.blogspot.com/2021/08/302-scara.html?m=0&quot; target=&quot;_blank&quot;&gt;訓練數學感 302 ─ 史卡拉手臂 (SCARA)&lt;/a&gt;&lt;/div&gt;&lt;/div&gt;</description><link>http://4rdp.blogspot.com/2026/04/blog-post.html</link><author>noreply@blogger.com (Bridan)</author><thr:total>0</thr:total></item><item><guid isPermaLink="false">tag:blogger.com,1999:blog-3550204829234352390.post-8529301061692320205</guid><pubDate>Wed, 08 Apr 2026 00:00:00 +0000</pubDate><atom:updated>2026-04-08T08:00:00.120+08:00</atom:updated><category domain="http://www.blogger.com/atom/ns#">數學錦囊</category><title>數學之美 48 ─ 水果難題</title><description>&lt;div class=&quot;separator&quot; style=&quot;clear: both; text-align: center;&quot;&gt;&lt;a href=&quot;https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjKhFrKsAi5sZfKVlrOmyNSmwtjE1UFmBuH_GTw3c9ctCd8JDmpOxUX9TcG1fWLvxYCz6392kiLmK3YlSBsvB70cbXxnleyFHii5vT1jXPPFxcGnwbULu-JNiHJcVvBOZQAJXDblNyDa8ct2JSLTrav1G5SK7K41SG_cKEhYrMNcBZC_JxsrNlTqffH3uPG/s785/627891982_3446543438830446_6672714655444963502_n.jpg&quot; style=&quot;margin-left: 1em; margin-right: 1em;&quot;&gt;&lt;img border=&quot;0&quot; data-original-height=&quot;785&quot; data-original-width=&quot;526&quot; height=&quot;640&quot; src=&quot;https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjKhFrKsAi5sZfKVlrOmyNSmwtjE1UFmBuH_GTw3c9ctCd8JDmpOxUX9TcG1fWLvxYCz6392kiLmK3YlSBsvB70cbXxnleyFHii5vT1jXPPFxcGnwbULu-JNiHJcVvBOZQAJXDblNyDa8ct2JSLTrav1G5SK7K41SG_cKEhYrMNcBZC_JxsrNlTqffH3uPG/w428-h640/627891982_3446543438830446_6672714655444963502_n.jpg&quot; width=&quot;428&quot; /&gt;&lt;/a&gt;&lt;/div&gt;&lt;div&gt;&lt;br /&gt;&lt;/div&gt;&lt;div&gt;數學梗：艾隆·阿米特（Alon Amit）的玩笑&lt;/div&gt;&lt;div&gt;​這道題在網路上常被稱為「水果難題」（常被畫成蘋果、香蕉和鳳梨的圖案）。&lt;/div&gt;&lt;div&gt;&lt;br /&gt;&lt;/div&gt;&lt;div&gt;原作者的初衷是展示：&lt;/div&gt;&lt;div&gt;​直覺的背離：看似微小的常數（如等於 4），其整數解可能大到驚人。&lt;/div&gt;&lt;div&gt;​解的敏感性：如果將 4 改成 6，解的位數會噴發到上百位甚至更多。&lt;/div&gt;&lt;div&gt;&lt;br /&gt;&lt;/div&gt;&lt;div&gt;​總結&lt;/div&gt;&lt;div&gt;​這是一張數學圈的經典迷因圖。樓上的發文者（000242424d）故意稱其為「國中數學題」來誤導或開玩笑，而樓下的回覆者（cerp_0423）則用那串誇張的 80 位數「反擊」了這種說法，並語帶諷刺地說這很「Trivial」（顯而易見的）。&lt;/div&gt;&lt;span&gt;&lt;a name=&#39;more&#39;&gt;&lt;/a&gt;&lt;/span&gt;&lt;div&gt;&lt;br /&gt;&lt;/div&gt;&lt;div&gt;這題在 FB 看到，bilibili 有人解說這題，請自行參考&lt;a href=&quot;請參考&quot; target=&quot;_blank&quot;&gt;影片&lt;/a&gt;。&lt;/div&gt;</description><link>http://4rdp.blogspot.com/2026/04/48.html</link><author>noreply@blogger.com (Bridan)</author><media:thumbnail xmlns:media="http://search.yahoo.com/mrss/" url="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjKhFrKsAi5sZfKVlrOmyNSmwtjE1UFmBuH_GTw3c9ctCd8JDmpOxUX9TcG1fWLvxYCz6392kiLmK3YlSBsvB70cbXxnleyFHii5vT1jXPPFxcGnwbULu-JNiHJcVvBOZQAJXDblNyDa8ct2JSLTrav1G5SK7K41SG_cKEhYrMNcBZC_JxsrNlTqffH3uPG/s72-w428-h640-c/627891982_3446543438830446_6672714655444963502_n.jpg" height="72" width="72"/><thr:total>0</thr:total></item><item><guid isPermaLink="false">tag:blogger.com,1999:blog-3550204829234352390.post-5713069799618075270</guid><pubDate>Sat, 04 Apr 2026 00:00:00 +0000</pubDate><atom:updated>2026-04-04T08:00:00.118+08:00</atom:updated><category domain="http://www.blogger.com/atom/ns#">數學考題</category><title>訓練數學感 431 ─ 求面積</title><description>&lt;div class=&quot;separator&quot; style=&quot;clear: both; text-align: center;&quot;&gt;&lt;a href=&quot;https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhHpNto-x5XmOTs-t8BW3tvu1t1hL_ToxFL8X8EKZ41HtPVPoB0h63_DwJFlhY9cVnGVD3w7GRJ9XnOsRF4UqNEZDEqaUnWVN45oxsYqS0gp2WsK4XG4YtjO8EIxnnVTouo7_yj0EjyolokT6fVMBAOMZUZ0H9SvEADsKj9EAHeAl11NgAfPN45vuiv_9FD/s403/646452457_26129547106654709_2096997606970012551_n.jpg&quot; imageanchor=&quot;1&quot; style=&quot;clear: left; float: left; margin-bottom: 1em; margin-right: 1em;&quot;&gt;&lt;img border=&quot;0&quot; data-original-height=&quot;384&quot; data-original-width=&quot;403&quot; height=&quot;305&quot; src=&quot;https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhHpNto-x5XmOTs-t8BW3tvu1t1hL_ToxFL8X8EKZ41HtPVPoB0h63_DwJFlhY9cVnGVD3w7GRJ9XnOsRF4UqNEZDEqaUnWVN45oxsYqS0gp2WsK4XG4YtjO8EIxnnVTouo7_yj0EjyolokT6fVMBAOMZUZ0H9SvEADsKj9EAHeAl11NgAfPN45vuiv_9FD/s320/646452457_26129547106654709_2096997606970012551_n.jpg&quot; width=&quot;320&quot; /&gt;&lt;/a&gt;&lt;/div&gt;如左圖，正方形內有一個直角三角形，求黃色區域的面積。&lt;div&gt;&lt;br /&gt;&lt;/div&gt;&lt;div&gt;難度&amp;nbsp;&lt;span style=&quot;font-family: &amp;quot;Trebuchet MS&amp;quot;, Trebuchet, Verdana, sans-serif; font-size: 16px; white-space-collapse: preserve;&quot;&gt;✩&lt;/span&gt;&lt;span style=&quot;font-family: &amp;quot;Trebuchet MS&amp;quot;, Trebuchet, Verdana, sans-serif; font-size: 16px; white-space-collapse: preserve;&quot;&gt;✩&lt;/span&gt;&lt;/div&gt;&lt;div&gt;&lt;span&gt;&lt;a name=&#39;more&#39;&gt;&lt;/a&gt;&lt;/span&gt;&lt;span style=&quot;font-family: &amp;quot;Trebuchet MS&amp;quot;, Trebuchet, Verdana, sans-serif; font-size: 16px; white-space-collapse: preserve;&quot;&gt;&lt;br /&gt;&lt;/span&gt;&lt;/div&gt;&lt;div&gt;&lt;span style=&quot;font-family: &amp;quot;Trebuchet MS&amp;quot;, Trebuchet, Verdana, sans-serif; font-size: 16px; white-space-collapse: preserve;&quot;&gt;這題在 FB 看到，很像以前蒐集的題目，&lt;/span&gt;&lt;/div&gt;&lt;div&gt;&lt;span style=&quot;font-family: Trebuchet MS, Trebuchet, Verdana, sans-serif;&quot;&gt;&lt;span style=&quot;white-space-collapse: preserve;&quot;&gt;&lt;a href=&quot;https://4rdp.blogspot.com/2025/11/419.html?m=0&quot; target=&quot;_blank&quot;&gt;訓練數學感 419 ─ 求三角形面積&lt;/a&gt;&lt;/span&gt;&lt;/span&gt;&lt;/div&gt;&lt;div&gt;&lt;span style=&quot;font-family: Trebuchet MS, Trebuchet, Verdana, sans-serif;&quot;&gt;&lt;span style=&quot;white-space-collapse: preserve;&quot;&gt;&lt;a href=&quot;https://4rdp.blogspot.com/2024/12/391.html?m=0&quot; target=&quot;_blank&quot;&gt;訓練數學感 391 ─ 求三角形面積&lt;/a&gt;&lt;/span&gt;&lt;/span&gt;&lt;/div&gt;</description><link>http://4rdp.blogspot.com/2026/04/431.html</link><author>noreply@blogger.com (Bridan)</author><media:thumbnail xmlns:media="http://search.yahoo.com/mrss/" url="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhHpNto-x5XmOTs-t8BW3tvu1t1hL_ToxFL8X8EKZ41HtPVPoB0h63_DwJFlhY9cVnGVD3w7GRJ9XnOsRF4UqNEZDEqaUnWVN45oxsYqS0gp2WsK4XG4YtjO8EIxnnVTouo7_yj0EjyolokT6fVMBAOMZUZ0H9SvEADsKj9EAHeAl11NgAfPN45vuiv_9FD/s72-c/646452457_26129547106654709_2096997606970012551_n.jpg" height="72" width="72"/><thr:total>0</thr:total></item><item><guid isPermaLink="false">tag:blogger.com,1999:blog-3550204829234352390.post-249133253276001999</guid><pubDate>Tue, 31 Mar 2026 00:00:00 +0000</pubDate><atom:updated>2026-03-31T08:00:00.121+08:00</atom:updated><category domain="http://www.blogger.com/atom/ns#">科學知識</category><title>螺旋槳如何在水下運作</title><description>&lt;iframe allow=&quot;autoplay; clipboard-write; encrypted-media; picture-in-picture; web-share&quot; allowfullscreen=&quot;true&quot; frameborder=&quot;0&quot; height=&quot;314&quot; scrolling=&quot;no&quot; src=&quot;https://www.facebook.com/plugins/video.php?height=314&amp;amp;href=https%3A%2F%2Fwww.facebook.com%2Freel%2F849779144565464%2F&amp;amp;show_text=false&amp;amp;width=560&amp;amp;t=0&quot; style=&quot;border: none; overflow: hidden;&quot; width=&quot;560&quot;&gt;&lt;/iframe&gt;
&lt;span&gt;&lt;a name=&#39;more&#39;&gt;&lt;/a&gt;&lt;/span&gt;&lt;div&gt;&lt;br /&gt;&lt;/div&gt;&lt;div&gt;船舶螺旋槳設計是一門學問，在快速旋轉下還要能防止海水滲漏不簡單。&lt;/div&gt;</description><link>http://4rdp.blogspot.com/2026/03/blog-post_31.html</link><author>noreply@blogger.com (Bridan)</author><thr:total>0</thr:total></item><item><guid isPermaLink="false">tag:blogger.com,1999:blog-3550204829234352390.post-1731692530056211380</guid><pubDate>Fri, 27 Mar 2026 00:00:00 +0000</pubDate><atom:updated>2026-03-27T08:00:00.137+08:00</atom:updated><category domain="http://www.blogger.com/atom/ns#">電機電子</category><title>運算放大器應用電路</title><description>&lt;div class=&quot;separator&quot; style=&quot;clear: both; text-align: center;&quot;&gt;&lt;a href=&quot;https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgt3imJwchcUgUj0EwsTeLatcQeuowhKyIL9gCvrDZF3BGPUzqj3uVfOAvaGzLlECTtjZ02LiTL0KVvw6Pxmb8YTTBGuHHBhMnm-w36msYWywYOWFJOJyvHvUOeSsrCR4C44QazC7MPl1UUIuossxgETkmGiR6bgMLg7D7rBNjFHzl9lCfLk1VS-5DLQtwG/s600/641399463_1378463650964323_1569962944820166154_n.jpg&quot; imageanchor=&quot;1&quot; style=&quot;margin-left: 1em; margin-right: 1em;&quot;&gt;&lt;img border=&quot;0&quot; data-original-height=&quot;507&quot; data-original-width=&quot;600&quot; height=&quot;540&quot; src=&quot;https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgt3imJwchcUgUj0EwsTeLatcQeuowhKyIL9gCvrDZF3BGPUzqj3uVfOAvaGzLlECTtjZ02LiTL0KVvw6Pxmb8YTTBGuHHBhMnm-w36msYWywYOWFJOJyvHvUOeSsrCR4C44QazC7MPl1UUIuossxgETkmGiR6bgMLg7D7rBNjFHzl9lCfLk1VS-5DLQtwG/w640-h540/641399463_1378463650964323_1569962944820166154_n.jpg&quot; width=&quot;640&quot; /&gt;&lt;/a&gt;&lt;/div&gt;&lt;span&gt;&lt;a name=&#39;more&#39;&gt;&lt;/a&gt;&lt;/span&gt;&lt;div class=&quot;separator&quot; style=&quot;clear: both; text-align: left;&quot;&gt;&lt;br /&gt;&lt;/div&gt;&lt;div class=&quot;separator&quot; style=&quot;clear: both; text-align: left;&quot;&gt;上圖列出四種運算放大器應用電路以及它們的信號波形，第一種放大電路非常常見。&lt;/div&gt;&lt;br /&gt;</description><link>http://4rdp.blogspot.com/2026/03/blog-post_27.html</link><author>noreply@blogger.com (Bridan)</author><media:thumbnail xmlns:media="http://search.yahoo.com/mrss/" url="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgt3imJwchcUgUj0EwsTeLatcQeuowhKyIL9gCvrDZF3BGPUzqj3uVfOAvaGzLlECTtjZ02LiTL0KVvw6Pxmb8YTTBGuHHBhMnm-w36msYWywYOWFJOJyvHvUOeSsrCR4C44QazC7MPl1UUIuossxgETkmGiR6bgMLg7D7rBNjFHzl9lCfLk1VS-5DLQtwG/s72-w640-h540-c/641399463_1378463650964323_1569962944820166154_n.jpg" height="72" width="72"/><thr:total>0</thr:total></item><item><guid isPermaLink="false">tag:blogger.com,1999:blog-3550204829234352390.post-369953033716717658</guid><pubDate>Mon, 23 Mar 2026 00:00:00 +0000</pubDate><atom:updated>2026-03-23T08:00:00.122+08:00</atom:updated><category domain="http://www.blogger.com/atom/ns#">數學考題</category><title>訓練數學感 430 ─ 有多少人又傻又呆又壞？</title><description>&lt;div class=&quot;separator&quot; style=&quot;clear: both; text-align: center;&quot;&gt;&lt;a href=&quot;https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi0ZZrsP-nWivnBiK0ZLuKgPKXOcE0DKnFbLtNLpvLfsg_K5iO7d6_UZXOq0ICF4FDDt1fCugCRJQ8Afr53Xjc_XHtyK-D8gsZv7Kx_XU6pyu6HmZGBlUgd2QQ65ugCNaLCQuwLIdlARVjAN7_r8ZRaUWTZZqkQbV4yaloDZiTuArGiamllCFDoWYsZZF1a/s1536/Copilot_20260223_135940.png&quot; imageanchor=&quot;1&quot; style=&quot;clear: left; float: left; margin-bottom: 1em; margin-right: 1em;&quot;&gt;&lt;img border=&quot;0&quot; data-original-height=&quot;1536&quot; data-original-width=&quot;1024&quot; height=&quot;320&quot; src=&quot;https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi0ZZrsP-nWivnBiK0ZLuKgPKXOcE0DKnFbLtNLpvLfsg_K5iO7d6_UZXOq0ICF4FDDt1fCugCRJQ8Afr53Xjc_XHtyK-D8gsZv7Kx_XU6pyu6HmZGBlUgd2QQ65ugCNaLCQuwLIdlARVjAN7_r8ZRaUWTZZqkQbV4yaloDZiTuArGiamllCFDoWYsZZF1a/s320/Copilot_20260223_135940.png&quot; width=&quot;213&quot; /&gt;&lt;/a&gt;&lt;/div&gt;&lt;br /&gt;10 個男人，6 個傻，8 個呆，9 個壞&lt;div&gt;&lt;br /&gt;&lt;div&gt;請問這 10 個男人中，最少有多少人又傻又呆又壞？&lt;/div&gt;&lt;/div&gt;&lt;div&gt;&lt;br /&gt;&lt;/div&gt;&lt;div&gt;難度&amp;nbsp;&lt;span style=&quot;font-size: 16px;&quot;&gt;✩&lt;/span&gt;&lt;/div&gt;&lt;div&gt;&lt;span&gt;&lt;a name=&#39;more&#39;&gt;&lt;/a&gt;&lt;/span&gt;&lt;span style=&quot;font-size: 16px;&quot;&gt;&lt;br /&gt;&lt;/span&gt;&lt;/div&gt;&lt;div&gt;&lt;span style=&quot;font-size: 16px;&quot;&gt;哈，一首歌也可以考數學！Copilot 產圖在繁中字體顯示不行，會出現怪字。&lt;/span&gt;&lt;/div&gt;</description><link>http://4rdp.blogspot.com/2026/03/430.html</link><author>noreply@blogger.com (Bridan)</author><media:thumbnail xmlns:media="http://search.yahoo.com/mrss/" url="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi0ZZrsP-nWivnBiK0ZLuKgPKXOcE0DKnFbLtNLpvLfsg_K5iO7d6_UZXOq0ICF4FDDt1fCugCRJQ8Afr53Xjc_XHtyK-D8gsZv7Kx_XU6pyu6HmZGBlUgd2QQ65ugCNaLCQuwLIdlARVjAN7_r8ZRaUWTZZqkQbV4yaloDZiTuArGiamllCFDoWYsZZF1a/s72-c/Copilot_20260223_135940.png" height="72" width="72"/><thr:total>2</thr:total></item><item><guid isPermaLink="false">tag:blogger.com,1999:blog-3550204829234352390.post-5973121190666622685</guid><pubDate>Thu, 19 Mar 2026 00:00:00 +0000</pubDate><atom:updated>2026-03-19T08:00:00.111+08:00</atom:updated><category domain="http://www.blogger.com/atom/ns#">科學知識</category><category domain="http://www.blogger.com/atom/ns#">電機電子</category><title>光的偏振 (Polarization of Light)</title><description>&lt;div class=&quot;separator&quot; style=&quot;clear: both; text-align: center;&quot;&gt;&lt;iframe allowfullscreen=&quot;&quot; class=&quot;BLOG_video_class&quot; height=&quot;266&quot; src=&quot;https://www.youtube.com/embed/8YkfEft4p-w&quot; width=&quot;320&quot; youtube-src-id=&quot;8YkfEft4p-w&quot;&gt;&lt;/iframe&gt;&lt;/div&gt;&lt;br /&gt;&lt;div&gt;這是很難得具象化解說光偏振的影片。&lt;/div&gt;&lt;span&gt;&lt;a name=&#39;more&#39;&gt;&lt;/a&gt;&lt;/span&gt;&lt;div&gt;&lt;br /&gt;&lt;/div&gt;&lt;div&gt;矽光子半導體，需要有這部分基礎知識。&lt;/div&gt;</description><link>http://4rdp.blogspot.com/2026/03/polarization-of-light.html</link><author>noreply@blogger.com (Bridan)</author><media:thumbnail xmlns:media="http://search.yahoo.com/mrss/" url="https://img.youtube.com/vi/8YkfEft4p-w/default.jpg" height="72" width="72"/><thr:total>0</thr:total></item><item><guid isPermaLink="false">tag:blogger.com,1999:blog-3550204829234352390.post-7206975704128621656</guid><pubDate>Sun, 15 Mar 2026 00:00:00 +0000</pubDate><atom:updated>2026-03-15T08:00:00.111+08:00</atom:updated><category domain="http://www.blogger.com/atom/ns#">數學考題</category><title>訓練數學感 429 ─ 求面積</title><description>&lt;div class=&quot;separator&quot; style=&quot;clear: both; text-align: center;&quot;&gt;&lt;a href=&quot;https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh0TBo5WN0AIAPUV6W-oB1cLtqNETCfw-AOE_9siDLLma61j3Wyt87d6t3a4OKWhTjx_QHMrL7ddvpAPrCu69njnNxNk-KBWx2MsG6DhaM0XvoE3D4Bo2yyX4d7HaYuCa0PmMiwVlOQohwnYMdRPEgOvjRp8UZvk70QJoxAAzc2vftoAdKmlb5-bY7yzNcR/s819/638421545_1323143913193201_3763440139705424690_n.jpg&quot; imageanchor=&quot;1&quot; style=&quot;clear: left; float: left; margin-bottom: 1em; margin-right: 1em;&quot;&gt;&lt;img border=&quot;0&quot; data-original-height=&quot;518&quot; data-original-width=&quot;819&quot; height=&quot;202&quot; src=&quot;https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh0TBo5WN0AIAPUV6W-oB1cLtqNETCfw-AOE_9siDLLma61j3Wyt87d6t3a4OKWhTjx_QHMrL7ddvpAPrCu69njnNxNk-KBWx2MsG6DhaM0XvoE3D4Bo2yyX4d7HaYuCa0PmMiwVlOQohwnYMdRPEgOvjRp8UZvk70QJoxAAzc2vftoAdKmlb5-bY7yzNcR/s320/638421545_1323143913193201_3763440139705424690_n.jpg&quot; width=&quot;320&quot; /&gt;&lt;/a&gt;&lt;/div&gt;如左圖，求藍色區塊面積。&lt;div&gt;&lt;br /&gt;&lt;/div&gt;&lt;div&gt;難度&amp;nbsp;&lt;span style=&quot;font-size: 16px;&quot;&gt;✩&lt;/span&gt;&lt;span style=&quot;font-size: 16px;&quot;&gt;✩&lt;span&gt;&lt;a name=&#39;more&#39;&gt;&lt;/a&gt;&lt;/span&gt;&lt;/span&gt;&lt;/div&gt;&lt;div&gt;&lt;span style=&quot;font-size: 16px;&quot;&gt;&lt;br /&gt;&lt;/span&gt;&lt;/div&gt;&lt;div&gt;&lt;span style=&quot;font-size: 16px;&quot;&gt;很難想像只給定黃綠兩區的面積數值就可以求解藍色區塊面積。&lt;/span&gt;&lt;/div&gt;</description><link>http://4rdp.blogspot.com/2026/03/429.html</link><author>noreply@blogger.com (Bridan)</author><media:thumbnail xmlns:media="http://search.yahoo.com/mrss/" url="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh0TBo5WN0AIAPUV6W-oB1cLtqNETCfw-AOE_9siDLLma61j3Wyt87d6t3a4OKWhTjx_QHMrL7ddvpAPrCu69njnNxNk-KBWx2MsG6DhaM0XvoE3D4Bo2yyX4d7HaYuCa0PmMiwVlOQohwnYMdRPEgOvjRp8UZvk70QJoxAAzc2vftoAdKmlb5-bY7yzNcR/s72-c/638421545_1323143913193201_3763440139705424690_n.jpg" height="72" width="72"/><thr:total>0</thr:total></item><item><guid isPermaLink="false">tag:blogger.com,1999:blog-3550204829234352390.post-3964526952821821299</guid><pubDate>Wed, 11 Mar 2026 00:00:00 +0000</pubDate><atom:updated>2026-03-11T08:00:00.144+08:00</atom:updated><category domain="http://www.blogger.com/atom/ns#">科學知識</category><title>石油提煉</title><description>&lt;iframe allow=&quot;autoplay; clipboard-write; encrypted-media; picture-in-picture; web-share&quot; allowfullscreen=&quot;true&quot; frameborder=&quot;0&quot; height=&quot;500&quot; scrolling=&quot;no&quot; src=&quot;https://www.facebook.com/plugins/video.php?href=https%3A%2F%2Fwww.facebook.com%2Fwatch%3Fv%3D1513680980371255&amp;amp;width=500&amp;amp;show_text=false&amp;amp;height=500&amp;amp;appId&quot; style=&quot;border: none; overflow: hidden;&quot; width=&quot;500&quot;&gt;&lt;/iframe&gt;&lt;span&gt;&lt;a name=&#39;more&#39;&gt;&lt;/a&gt;&lt;/span&gt;&lt;div&gt;&lt;br /&gt;&lt;/div&gt;&lt;div&gt;二月底以色列和美國對伊朗開戰，石油對現代社會非常重要，這部影片說明原油可以提煉那些物資，我的理解是美國想藉由石油控制來打擊中國經濟，因為全球約有 20% 原油必須經過荷姆茲海峽運送出口，又中國大約 40 % 原油倚賴進口，中東問題歷史悠久且複雜，是隨時可能引爆的彈藥庫，經濟又牽扯中美對抗，戰爭若不盡早解決，搞大了還真可能第三次世界大戰。&lt;/div&gt;</description><link>http://4rdp.blogspot.com/2026/03/blog-post_11.html</link><author>noreply@blogger.com (Bridan)</author><thr:total>0</thr:total></item><item><guid isPermaLink="false">tag:blogger.com,1999:blog-3550204829234352390.post-4214992278169663907</guid><pubDate>Sat, 07 Mar 2026 00:00:00 +0000</pubDate><atom:updated>2026-03-07T08:00:00.128+08:00</atom:updated><category domain="http://www.blogger.com/atom/ns#">雜七雜八</category><title>從荒島求生學習經濟學</title><description>&lt;iframe allow=&quot;autoplay; clipboard-write; encrypted-media; picture-in-picture; web-share&quot; allowfullscreen=&quot;true&quot; frameborder=&quot;0&quot; height=&quot;476&quot; scrolling=&quot;no&quot; src=&quot;https://www.facebook.com/plugins/video.php?height=476&amp;amp;href=https%3A%2F%2Fwww.facebook.com%2Freel%2F2607718406272223%2F&amp;amp;show_text=false&amp;amp;width=476&amp;amp;t=0&quot; style=&quot;border: none; overflow: hidden;&quot; width=&quot;476&quot;&gt;&lt;/iframe&gt;&lt;div&gt;&lt;br /&gt;&lt;/div&gt;&lt;div&gt;這部影片蠻有趣的，能夠讓你快速理解經濟學要義。&lt;/div&gt;&lt;span&gt;&lt;a name=&#39;more&#39;&gt;&lt;/a&gt;&lt;/span&gt;&lt;div&gt;&lt;br /&gt;&lt;/div&gt;&lt;div&gt;延遲消費，創造資本工具就是經濟的開始，學到應該為生產貸款而非消費貸款，經濟的本質是生產而不是消費，前者才能讓日子越過越好。&lt;/div&gt;</description><link>http://4rdp.blogspot.com/2026/03/blog-post.html</link><author>noreply@blogger.com (Bridan)</author><thr:total>2</thr:total></item><item><guid isPermaLink="false">tag:blogger.com,1999:blog-3550204829234352390.post-4673873325731526007</guid><pubDate>Tue, 03 Mar 2026 00:00:00 +0000</pubDate><atom:updated>2026-03-03T08:00:00.114+08:00</atom:updated><category domain="http://www.blogger.com/atom/ns#">數學考題</category><title>訓練數學感 428 ─ 求角度</title><description>&lt;div class=&quot;separator&quot; style=&quot;clear: both; text-align: center;&quot;&gt;&lt;a href=&quot;https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiuZJhbGZkR2P3tr9Il4OXvStkiAbBTQWsq2cBmFUeOWnpSGkUDoe4slq_cyYwR7D5_qecDpIbPFsQQRGIbSj2UNNziG4BrhfGEYO2FiC98hS5ELmiCn2NuBrlSvHAOLk5TEmkQkDLJvNlJn_nT82jbyRNIXG4f24GFJRd_YaY0ZUIMjKR1j_suUOvqzam8/s770/619074753_2284033142023947_6983469635275972463_n.jpg&quot; imageanchor=&quot;1&quot; style=&quot;clear: left; float: left; margin-bottom: 1em; margin-right: 1em;&quot;&gt;&lt;img border=&quot;0&quot; data-original-height=&quot;487&quot; data-original-width=&quot;770&quot; height=&quot;202&quot; src=&quot;https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiuZJhbGZkR2P3tr9Il4OXvStkiAbBTQWsq2cBmFUeOWnpSGkUDoe4slq_cyYwR7D5_qecDpIbPFsQQRGIbSj2UNNziG4BrhfGEYO2FiC98hS5ELmiCn2NuBrlSvHAOLk5TEmkQkDLJvNlJn_nT82jbyRNIXG4f24GFJRd_YaY0ZUIMjKR1j_suUOvqzam8/s320/619074753_2284033142023947_6983469635275972463_n.jpg&quot; width=&quot;320&quot; /&gt;&lt;/a&gt;&lt;/div&gt;如左圖，求 X 角度。&lt;div&gt;&lt;br /&gt;&lt;/div&gt;&lt;div&gt;&lt;span face=&quot;&amp;quot;Trebuchet MS&amp;quot;, Trebuchet, Verdana, sans-serif&quot; style=&quot;font-size: 16px;&quot;&gt;難度&lt;/span&gt;&lt;span face=&quot;&amp;quot;Segoe UI Historic&amp;quot;, &amp;quot;Segoe UI&amp;quot;, Helvetica, Arial, sans-serif&quot; style=&quot;color: #080809; font-size: 16px;&quot;&gt;&lt;span style=&quot;font-size: 15px; white-space-collapse: preserve;&quot;&gt; &lt;/span&gt;&lt;/span&gt;&lt;span style=&quot;font-size: 16px;&quot;&gt;✩&lt;/span&gt;&lt;span style=&quot;font-size: 16px;&quot;&gt;✩&lt;/span&gt;&lt;/div&gt;&lt;div&gt;&lt;span&gt;&lt;a name=&#39;more&#39;&gt;&lt;/a&gt;&lt;/span&gt;&lt;span style=&quot;font-size: 16px;&quot;&gt;&lt;br /&gt;&lt;/span&gt;&lt;/div&gt;&lt;div&gt;&lt;span style=&quot;font-size: 16px;&quot;&gt;雖然只是純角度計算，並且也不用畫輔助線，但是要想到運用&lt;/span&gt;&lt;span style=&quot;font-size: 16px;&quot;&gt;三角形特性來求解，還是很難。&lt;/span&gt;&lt;/div&gt;</description><link>http://4rdp.blogspot.com/2026/03/428.html</link><author>noreply@blogger.com (Bridan)</author><media:thumbnail xmlns:media="http://search.yahoo.com/mrss/" url="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiuZJhbGZkR2P3tr9Il4OXvStkiAbBTQWsq2cBmFUeOWnpSGkUDoe4slq_cyYwR7D5_qecDpIbPFsQQRGIbSj2UNNziG4BrhfGEYO2FiC98hS5ELmiCn2NuBrlSvHAOLk5TEmkQkDLJvNlJn_nT82jbyRNIXG4f24GFJRd_YaY0ZUIMjKR1j_suUOvqzam8/s72-c/619074753_2284033142023947_6983469635275972463_n.jpg" height="72" width="72"/><thr:total>0</thr:total></item></channel></rss>