题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104045849-78932.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104045849-12215.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104045849-33001.png)
A. 4 | B. 8 | C. 0 | D.2 |
答案
解析
试题分析:根据题意,由于向量
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104045849-78932.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104045849-12215.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104045849-33001.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104045849-93202.png)
解得x的值为4,故答案为A.
点评:主要是考查了向量共线的坐标运算,属于基础题。
核心考点
试题【已知向量,若与共线,则x的值为( )A. 4B. 8C. 0D.2】;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/20191104/20191104045843-48156.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104045844-10498.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104045829-82576.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104045830-60846.png)
(1)求证:
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104045830-52622.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104045830-27749.png)
(2)若
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104045830-66562.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104045830-15211.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104045831-75445.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104045831-94401.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104045822-32109.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104045823-58633.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104045823-61894.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104045823-77500.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104045823-46406.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104045824-86158.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104045814-21777.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104045815-72491.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104045815-25576.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104045815-62047.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104045815-10885.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104045815-65401.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104045816-97689.png)
(Ⅰ)用
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104045816-25834.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104045816-55230.png)
(Ⅱ)求
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104045816-55230.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104045815-25576.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104045815-62047.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104045816-48681.png)
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