题目
题型:不详难度:来源:
已知:向量
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104073305-20856.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104073305-45578.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104073306-88600.gif)
(1)若
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104073306-32150.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104073306-78430.gif)
(2)求:
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104073306-34755.gif)
答案
(1)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104073306-84571.gif)
(2)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104073307-73760.gif)
解析
解:(1)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104073306-32150.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104073307-65684.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104073307-17494.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104073307-65684.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104073307-38487.gif)
∵
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104073306-88600.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104073306-84571.gif)
(2)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104073307-55939.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104073308-67532.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104073308-84769.gif)
∵
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104073306-88600.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104073308-69028.gif)
∴当
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104073309-68424.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104073306-34755.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104073309-57074.gif)
∴最大值为
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104073309-54717.gif)
核心考点
试题【(本小题满分13分)已知:向量,向量,,(1)若,求:的值; (2)求:的最大值】;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/20191104/20191104073258-11449.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104073258-70224.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104073259-47032.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104073259-68935.png)
A.![]() | B.2![]() | C.4 | D.12 |
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104073252-32607.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104073252-32846.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104073252-97573.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104073252-11480.png)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104073246-79063.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104073246-37431.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104073246-88568.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104073246-79634.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104073241-13306.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104073241-15140.gif)
(2)若
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104073241-52969.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104073242-87841.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104073242-60064.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104073242-69085.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104073235-33364.gif)
(1)若
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104073236-27495.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104073236-79915.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104073236-15971.gif)
(2)若
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104073236-45882.gif)
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