题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105020915-39332.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105020915-19047.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105020915-26241.png)
(1)求
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105020915-39332.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105020915-84118.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105020915-19047.png)
(2) 求
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105020916-83801.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105020916-94236.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105020916-78835.png)
解析
试题分析:解:(1)由条件
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105020916-45815.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105020917-95743.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105020916-94236.png)
(2)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105020917-51615.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105020917-15046.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105020917-35419.png)
所以
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105020916-78835.png)
点评:主要是考查了向量的数量积的做坐标运算以及性质的运用,属于基础题。
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105020908-43879.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105020909-69640.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105020909-62414.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105020909-78454.jpg)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105020903-49958.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105020903-84089.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105020904-78857.png)
A.![]() | B.![]() | C.![]() | D.a |
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105020854-31876.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105020854-50572.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105020854-48656.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105020854-28832.png)
(1)若
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105020855-61619.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105020855-32798.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105020855-29290.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105020855-56522.png)
(2)若
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105020856-88941.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105020856-55414.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105020846-82006.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105020846-61428.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105020846-67171.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105020846-38313.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105020847-46506.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105020847-57562.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105020841-76005.png)
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