题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104045231-11195.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104045231-73932.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104045231-30427.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104045232-65690.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104045232-74519.png)
A.![]() | B.![]() | C.![]() | D.![]() |
答案
解析
试题分析:先用向量的点乘将
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104045233-69460.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104045233-41407.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104045233-99960.png)
核心考点
试题【已知平面向量的夹角为,且,,则等于( )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/20191104/20191104045220-63888.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104045220-33476.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104045220-28750.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104045220-29107.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104045221-37666.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104045221-65808.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104045221-31266.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104045221-16155.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104045222-97867.png)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104045209-30186.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104045209-59198.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104045209-90576.png)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104045204-70373.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104045204-83589.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104045204-35456.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104045204-14093.png)
A.![]() | B.![]() | C.4 | D.12 |
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104045158-64273.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104045158-43908.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104045159-25101.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104045159-32445.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104045159-17461.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104045159-14051.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104045146-94935.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104045146-95911.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104045146-87897.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104045147-93686.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104045147-97837.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104045147-35833.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104045147-35974.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104045147-78987.png)
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