题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104034138-55864.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104034138-99631.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104034138-52052.png)
(1)求
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104034138-34633.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104034139-69618.png)
(2)若
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104034139-94018.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104034139-91729.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104034139-21402.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104034139-96158.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104034139-66371.png)
解析
试题分析:解题思路:(1)利用平面向量的数量积公式、模长公式求解;(2)将
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104034140-78911.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104034140-59540.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104034140-56511.png)
试题解析:(1)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104034140-27738.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104034140-73240.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104034141-50747.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104034141-44859.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104034141-52115.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104034141-43144.png)
当
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104034141-57227.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104034141-49833.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104034141-57716.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104034142-33262.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104034142-65256.png)
当
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104034142-75843.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104034142-55251.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104034141-57716.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104034142-20430.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104034142-21779.png)
当
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104034143-87996.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104034143-97443.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104034141-57716.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104034143-80597.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104034143-43861.png)
综上所述,
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104034142-65256.png)
核心考点
试题【已知向量,,且.(1)求及;(2)若的最小值为,求实数的值.】;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/20191104/20191104034131-16659.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104034131-78436.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104034131-36967.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104034132-13864.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104034132-39866.png)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104034126-66808.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104034126-32731.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104034126-87567.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104034127-99891.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104034116-53149.png)
(1)若
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104034117-40755.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104034117-35678.png)
(2)设函数
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104034117-78537.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104034117-69026.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104034105-50461.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104034106-31247.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104034100-19029.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104034100-46335.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104034100-28187.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104034101-93303.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104034101-24750.png)
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