题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104065056-25688.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104065056-93732.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104065057-80399.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104065057-50076.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104065057-38825.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104065057-91221.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104065058-67173.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104065058-74958.gif)
线
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104065058-32398.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104065058-14571.gif)
⑴求使
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104065059-46716.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104065059-87375.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104065059-40560.gif)
⑵对(1)中的点
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104065058-74958.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104065059-46390.gif)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104065100-70575.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104065100-51528.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104065100-79971.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104065100-48391.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104065101-80382.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104065101-27998.gif)
所以
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104065101-46188.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104065101-71901.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104065102-53928.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104065102-90294.gif)
则
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104065102-50835.gif)
当
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104065102-27064.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104065103-36079.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104065103-31282.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104065103-61719.gif)
(2)因为
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104065103-31547.gif)
解析
核心考点
试题【(本小题满分10分)已知=,= ,=,设是直线上一点,是坐标原点⑴求使取最小值时的; ⑵对(1)中的点,求的余弦值。】;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/20191104/20191104065051-39859.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104065052-10813.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104065052-77246.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104065052-66181.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104065048-12661.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104065049-55950.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104065049-53114.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104065044-47504.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104065045-51528.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104065045-95498.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104065045-38980.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104065046-82177.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104065046-66476.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104065037-14947.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104065037-24807.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104065037-74093.gif)
(1)若
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104065037-66933.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104065037-37337.gif)
(2)求△
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104065038-23966.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104065019-87413.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104065019-47205.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104065019-91678.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104065020-11513.png)
A.![]() | B.![]() ![]() | C.![]() | D.![]() |
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