题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104042314-84754.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104042314-56620.png)
A.1 | B.3 | C.5 | D.9 |
答案
解析
解:过点C作AB的垂线,垂足为D.
由条件得
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104042314-84754.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104042315-52246.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104042315-11482.png)
核心考点
试题【在△ABC中,=1,=2,则AB边的长度为( )A.1B.3C.5D.9】;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/20191104/20191104042310-11798.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104042310-41624.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104042310-70146.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104042310-11798.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104042310-41624.png)
A.-2 | B.2 | C.±4 | D.±2 |
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104042305-27716.png)
(A)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104042306-33103.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104042306-36790.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104042306-45894.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104042306-33103.png)
(C)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104042306-36790.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104042306-33103.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104042306-36790.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104042306-36790.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104042300-10786.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104042300-28198.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104042300-39179.png)
(1)求D点的坐标.
(2)若D点在第二象限,用
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104042300-10786.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104042300-28198.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104042300-49088.png)
(3)设
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104042300-70298.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104042300-10786.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104042300-49088.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104042300-70298.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104042300-70298.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104042251-28531.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104042251-81693.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104042251-64224.png)
A.0 | B.1 | C.2 | D.3 |
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104042243-59683.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104042244-31401.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104042244-76618.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104042244-63550.jpg)
A.![]() | B.![]() | C.![]() | D.![]() |
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