题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104013803-70172.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104013803-43406.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104013804-30284.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104013804-76585.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104013804-31759.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104013804-61996.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104013805-88617.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104013805-36739.png)
(Ⅰ)试用
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104013805-36006.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104013805-70690.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104013805-36006.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104013806-63576.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104013805-70690.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104013806-83089.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104013806-63780.png)
解析
试题分析:(Ⅰ)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104013807-91990.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104013807-71800.png)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104013805-70690.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104013807-52461.png)
(Ⅱ)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104013807-91990.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104013807-68748.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104013807-84536.png)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104013808-64452.png)
点评:本题考查运用已知向量表示未知向量,关键是巧妙的构造三角形让已知向量和未知向量联系起来.属基础题.
核心考点
试题【如图:在中,为中点, ,,设(Ⅰ)试用表示; (Ⅱ)试用表示.】;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/20191104/20191104013759-30914.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104013759-77022.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104013759-30914.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104013759-77022.png)
A.![]() | B.2 | C.![]() | D.10 |
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104013747-22117.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104013747-70228.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104013747-22117.png)
A.平行四边形 | B.菱形 | C.矩形 | D.正方形 |
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104013740-57203.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104013740-35347.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104013740-32569.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104013740-49681.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104013741-51250.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104013741-72672.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104013741-99399.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104013741-76395.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104013742-75917.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104013742-73466.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104013742-72872.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104013742-33695.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104013743-48864.png)
(A)1 (B)2 (C)3 (D)4
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104013734-55489.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104013734-14729.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104013735-64768.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104013726-57069.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104013727-10919.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104013727-66026.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104013727-33914.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104013727-68713.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104013728-18896.png)
(1)求实数
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104013728-25189.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104013728-54439.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104013728-23186.png)
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