<?xml version="1.0" encoding="utf-8" standalone="yes"?><rss version="2.0" xmlns:atom="http://www.w3.org/2005/Atom" xmlns:content="http://purl.org/rss/1.0/modules/content/"><channel><title>平面向量 on MathManStudio.com</title><link>https://mathmanstudio.com/categories/%E5%B9%B3%E9%9D%A2%E5%90%91%E9%87%8F/</link><description>Recent content in 平面向量 on MathManStudio.com</description><generator>Hugo</generator><language>zh-TW</language><lastBuildDate>Mon, 13 Jul 2026 20:35:58 +0800</lastBuildDate><atom:link href="https://mathmanstudio.com/categories/%E5%B9%B3%E9%9D%A2%E5%90%91%E9%87%8F/index.xml" rel="self" type="application/rss+xml"/><item><title>114高中數學學測數A(多選11)</title><link>https://mathmanstudio.com/posts/114%E9%AB%98%E4%B8%AD%E6%95%B8%E5%AD%B8%E5%AD%B8%E6%B8%AC%E6%95%B8a%E5%A4%9A%E9%81%B811/</link><pubDate>Mon, 13 Jul 2026 20:35:58 +0800</pubDate><guid>https://mathmanstudio.com/posts/114%E9%AB%98%E4%B8%AD%E6%95%B8%E5%AD%B8%E5%AD%B8%E6%B8%AC%E6%95%B8a%E5%A4%9A%E9%81%B811/</guid><description>&lt;p&gt;&lt;img loading="lazy" src="https://mathmanstudio.com/wp-content/uploads/2026/07/%E6%88%AA%E5%9C%96-2026-07-13-%E6%99%9A%E4%B8%8A7.46.06-1024x397.png"&gt;&lt;/p&gt;
&lt;p&gt;（1）根據內分比性質可得&lt;/p&gt;
&lt;p&gt;$$
\overline{CP}:\overline{PD}=4:3
$$
$$
\Rightarrow\overline{CP}=\frac{4}{7}\overline{CD}
$$&lt;/p&gt;
&lt;p&gt;(2)利用向量加法性質轉換，做出線性組合。&lt;/p&gt;
&lt;p&gt;$$
\overrightarrow{AP}＝\overrightarrow{AC}+\overrightarrow{CP}=\overrightarrow{AC}+\frac{4}{7}\overrightarrow{CD}=\overrightarrow{AC}+\frac{4}{7}(\overrightarrow{CA}+\overrightarrow{AD})=\frac{3}{7}\overrightarrow{AC}+\frac{2}{7}\overrightarrow{AB}
$$&lt;/p&gt;
&lt;p&gt;(3)餘弦定理，送分啦！&lt;/p&gt;
&lt;p&gt;$$
cos\angle{BAC}=\frac{25+36-16}{2\times5\times6}=\frac{3}{4}
$$&lt;/p&gt;
&lt;p&gt;(4)三邊長都給你了，還有別的嗎？當然是海龍公式，送分啦！&lt;/p&gt;
&lt;p&gt;$$
\triangle{ABC}_a=\sqrt{\frac{15}{2}\times\frac{5}{2}\times\frac{3}{2}\times\frac{7}{2}}=\frac{15}{4}\sqrt{7}
$$
$$
\triangle{ACP}_a=\frac{15}{4}\sqrt{7}\times\frac{1}{2}\times\frac{4}{7}=\frac{15}{14}\sqrt{7}
$$&lt;/p&gt;
&lt;p&gt;(5)高中數學的多選題後面的選項，不要空想，常常會用到前面算出來的東西，前面做不出來後面就很難拿分！&lt;/p&gt;
&lt;p&gt;$$
\overrightarrow{AP}\cdot\overrightarrow{AC}=(\frac{3}{7}\overrightarrow{AC}+\frac{2}{7}\overrightarrow{AB})\cdot\overrightarrow{AC}=\frac{120}{7}
$$&lt;/p&gt;
&lt;p&gt;Ans:(3)(4)(5)&lt;/p&gt;</description></item><item><title>114高中數學學測數A (多選8)</title><link>https://mathmanstudio.com/posts/114%E9%AB%98%E4%B8%AD%E6%95%B8%E5%AD%B8%E5%AD%B8%E6%B8%AC%E6%95%B8a-%E5%A4%9A%E9%81%B88/</link><pubDate>Wed, 01 Jul 2026 20:36:41 +0800</pubDate><guid>https://mathmanstudio.com/posts/114%E9%AB%98%E4%B8%AD%E6%95%B8%E5%AD%B8%E5%AD%B8%E6%B8%AC%E6%95%B8a-%E5%A4%9A%E9%81%B88/</guid><description>&lt;p&gt;&lt;img loading="lazy" src="https://mathmanstudio.com/wp-content/uploads/2026/07/%E6%88%AA%E5%9C%96-2026-07-01-%E6%99%9A%E4%B8%8A7.33.00-1024x397.png"&gt;&lt;/p&gt;
&lt;p&gt;將原式配方整理後可得圓方程式如下：&lt;/p&gt;
&lt;p&gt;$$
（x-1）^2+y^2=4
$$&lt;/p&gt;
&lt;p&gt;此為圓心（1,0）半徑=2之圓方程式&lt;/p&gt;
&lt;p&gt;$$
(1)直線方程式x=3與此圓方程式之切線，交於1點，有兩相等實根。
$$&lt;/p&gt;
&lt;p&gt;（2）此圖形並未於原點有點對稱的現象。&lt;/p&gt;
&lt;p&gt;（3）正確。&lt;/p&gt;
&lt;p&gt;（4）解方程式判斷有無交點即可。&lt;/p&gt;
&lt;p&gt;$$
y=-x+4\quad代入（x-1）^2+y^2=4
$$
$$
整理後可得x^2-5x+\frac{13}{2}=0
$$
$$
判別式&amp;lt;0\rightarrow無交點
$$&lt;/p&gt;
&lt;p&gt;(5)求極值當然用柯西不等式啦！&lt;/p&gt;
&lt;p&gt;$$
令\vec{a}=(x-1,y)\quad\vec{b}=(1,-1)
$$
$$
[(x-1)^2+y^2]\times[1^2+(-1)^2]\ge（x-1-y）^2
$$
$$
1-2\sqrt{2}\le x-y\le1+2\sqrt{2}
$$&lt;/p&gt;
&lt;p&gt;正解：（3）（5）&lt;/p&gt;</description></item><item><title>113高中數學分科測驗練功坊 二次曲線平面向量(倒數26天上戰場)</title><link>https://mathmanstudio.com/posts/113%E9%AB%98%E4%B8%AD%E6%95%B8%E5%AD%B8%E5%88%86%E7%A7%91%E6%B8%AC%E9%A9%97%E7%B7%B4%E5%8A%9F%E5%9D%8A-%E4%BA%8C%E6%AC%A1%E6%9B%B2%E7%B7%9A%E5%B9%B3%E9%9D%A2%E5%90%91%E9%87%8F%E5%80%92%E6%95%B824/</link><pubDate>Sat, 15 Jun 2024 00:30:21 +0800</pubDate><guid>https://mathmanstudio.com/posts/113%E9%AB%98%E4%B8%AD%E6%95%B8%E5%AD%B8%E5%88%86%E7%A7%91%E6%B8%AC%E9%A9%97%E7%B7%B4%E5%8A%9F%E5%9D%8A-%E4%BA%8C%E6%AC%A1%E6%9B%B2%E7%B7%9A%E5%B9%B3%E9%9D%A2%E5%90%91%E9%87%8F%E5%80%92%E6%95%B824/</guid><description>&lt;p&gt;&lt;img loading="lazy" src="https://mathmanstudio.com/wp-content/uploads/2024/06/37-1-1024x465.jpg"&gt;
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&lt;p&gt;影片詳解&lt;/p&gt;
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