题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104042726-88093.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104042727-65259.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104042727-98374.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104042727-92557.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104042727-58469.png)
A.![]() | B.![]() | C.![]() | D.![]() |
答案
解析
试题分析:记单位圆的圆心为
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104042729-45867.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104042727-92557.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104042729-89014.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104042729-62368.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104042729-84058.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104042730-55601.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104042730-26588.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104042730-65781.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104042730-35528.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104042730-93790.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104042731-83114.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104042727-58469.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104042728-26342.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104042731-95121.png)
核心考点
试题【已知、、是单位圆上三个互不相同的点.若,则的最小值是( )A..B..C..D..】;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/20191104/20191104042721-30159.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104042721-28839.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104042721-50334.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104042721-74220.png)
A.12 | B.16 | C.32 | D.64 |
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104042713-32875.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104042713-64791.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104042713-72672.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104042713-70672.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104042713-70672.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104042713-48190.png)
(1)求函数
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104042713-66586.png)
(2)若
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104042713-64219.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104042713-48190.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104042713-81723.png)
A.-14 | B.-6 | C.6 | D.14 |
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104042658-37919.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104042658-74360.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104042658-51193.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104042658-99451.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104042658-39090.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
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