题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104062342-12240.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104062342-63847.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104062343-80281.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104062343-35948.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104062343-39531.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104062344-44449.png)
A.![]() | B.![]() | C.![]() | D.![]() |
答案
解析
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104062345-16445.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104062345-51597.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104062346-66233.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104062346-18266.png)
核心考点
试题【平面向量与的夹角为,,,则( )A.B.C.D.】;主要考察你对平面向量数量积的意义等知识点的理解。[详细]
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104062339-73505.png)
A.30° | B.45° | C.90° | D.135° |
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104062334-13390.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104062335-78881.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104062335-38319.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104062335-20362.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104062328-43549.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104062328-94958.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104062329-43162.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104062329-56384.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104062321-77815.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104062321-11325.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104062322-60747.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104062322-96386.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104062322-26080.png)
A.30° | B.60° | C.120° | D.150° |
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104062314-60002.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104062314-90447.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104062314-73086.png)
(1) 求证:
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104062314-36877.png)
(2)若
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104062314-60942.png)
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