题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104033855-12835.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104033855-38304.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104033855-88283.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104033855-38304.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104033855-88283.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104033855-49959.png)
(1)求
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104033855-64558.png)
(2)求
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104033855-75883.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104033856-65990.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104033856-16716.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104033856-84753.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104033856-75529.png)
解析
试题分析:解题思路:(1)利用平面向量的模长公式
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104033857-69811.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104033857-54171.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104033855-12835.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104033857-68340.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104033857-69619.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104033858-50582.png)
试题解析:(1)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104033858-13903.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104033858-75248.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104033858-11318.png)
设
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104033857-68340.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104033859-46445.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104033856-16716.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104033859-20944.png)
又
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104033859-18963.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104033856-75529.png)
核心考点
试题【设向量满足||=||=1,且|2-|=.(1)求的值; (2)求与夹角.】;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/20191104/20191104033848-53995.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104033848-30834.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104033848-82056.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104033839-20086.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104033839-31306.png)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104033832-35323.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104033832-26000.png)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104033827-92810.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104033827-99808.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104033827-96411.png)
A.(-3,0) | B.(2,0) | C.(3,0) | D.(4,0) |
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104033821-74047.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104033821-17686.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104033822-41397.png)
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