题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104052246-49397.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104052247-48012.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104052247-45188.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104052247-63960.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104052247-72532.png)
A.![]() | B.![]() | C.7 | D.3 |
答案
解析
试题分析:令
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104052248-77547.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104052249-67195.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104052249-40695.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104052249-67649.png)
所以
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104052249-73843.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104052250-82941.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104052247-72532.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104052250-34576.png)
点评:本题的核心是要熟记基本公式,求出向量
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104052250-78787.png)
核心考点
试题【平面向量与的夹角为,,则=( )A.B.C.7D.3】;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/20191104/20191104052241-14599.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104052242-15347.png)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104052235-65331.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104052236-48318.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104052236-90321.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104052227-76664.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104052227-85072.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104052228-18943.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104052228-95857.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104052228-83656.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104052227-76664.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104052220-89792.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104052221-98150.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104052221-73837.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104052221-54531.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104052222-11830.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104052222-68349.png)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104052214-63167.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104052214-18090.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104052214-43914.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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