题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104013620-18151.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104013620-79915.png)
求
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104013620-69052.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104013621-96176.png)
若
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104013621-97895.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104013621-30220.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104013621-11499.png)
求
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104013622-75635.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104013622-15188.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104013622-92658.png)
(2)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104013622-96971.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104013623-26010.png)
(3)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104013623-40798.png)
解析
试题分析:(1)根据题意,由于
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104013620-79915.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104013622-15188.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104013622-92658.png)
(2)根据题意,由于
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104013621-97895.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104013623-34576.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104013622-96971.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104013624-94371.png)
(3)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104013624-76068.png)
点评:本试题主要是考查了向量的坐标运算,以及向量的数量积公式的运用,属于中档题。
核心考点
试题【已知平面直角坐标系中,点为原点,.求的坐标及;若,求及的坐标;求.】;主要考察你对平面向量的基本定理及坐标表示等知识点的理解。[详细]
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104013613-40932.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104013613-35825.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104013613-33023.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104013614-67883.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104013614-98663.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104013614-49697.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104013614-95842.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104013614-13707.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104013615-40561.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104013614-67883.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104013613-35825.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104013615-88632.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104013615-73866.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104013602-27472.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104013603-85969.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104013603-38631.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104013603-28105.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104013603-21257.png)
(1)当
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104013604-28952.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104013602-27472.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104013603-38631.png)
(2)若函数
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104013604-52167.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104013602-27472.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104013603-38631.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104013604-83748.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104013604-13898.png)
A.(-2,-1) | B.(2,1) | C.(3,-1) | D.(-3,1) |
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104013553-75687.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104013553-43890.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104013554-21167.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104013554-26748.png)
A.-1 | B.1 | C.-2 | D.2 |
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104013549-55433.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104013549-59560.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104013549-49968.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104013550-78850.png)
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