题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104040611-57445.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104040611-69084.png)
A.![]() | B.![]() | C.![]() | D.![]() |
答案
解析
试题分析:因为
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104040612-87357.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104040612-50719.png)
所以,
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104040613-33810.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104040613-41106.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104040613-29444.png)
又因为
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104040613-99324.png)
所以
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104040614-92375.png)
设
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104040611-69084.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104040614-37387.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104040614-22035.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104040614-68749.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104040615-68189.png)
故选D.
核心考点
试题【已知点A(3,0),B(0,3),C(cosα,sinα),O(0,0),若,则的夹角为( )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/20191104/20191104040605-44164.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104040605-10456.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104040606-24688.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104040606-19167.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104040559-42967.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104040559-93980.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104040559-41267.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104040559-72883.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104040559-72918.png)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104040551-31145.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104040552-33805.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104040544-99748.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104040545-92317.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104040545-20954.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104040545-45503.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104040545-81303.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104040545-94176.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104040546-28128.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104040546-73542.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104040546-46465.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104040546-67770.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104040534-65814.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104040535-84783.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104040535-48812.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104040535-53604.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104040535-65389.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104040535-52913.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104040535-87072.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104040536-21761.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104040536-84752.png)
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