题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104081817-63308.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104081817-42858.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104081817-72623.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104081817-94090.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104081818-40068.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104081818-13945.gif)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104081818-68978.gif)
解析
核心考点
试题【在中,,,是边的中点,则 ;】;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/20191104/20191104081806-98671.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104081806-21483.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104081807-75513.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104081807-62315.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104081807-43284.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104081807-27772.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104081807-62315.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104081808-56669.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104081808-43717.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104081808-53853.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104081808-12546.gif)
求:
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104081808-19375.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104081809-21184.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104081759-51601.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104081759-31503.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104081759-52587.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104081759-27722.gif)
(1)若
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104081759-49450.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104081759-98020.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104081759-74931.gif)
(2)若
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104081759-43727.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104081759-64634.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104081800-96686.gif)
(3)若
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104081800-96686.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104081800-70026.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104081752-14191.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104081752-90432.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104081746-67434.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104081747-35594.gif)
(1)求
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104081747-46813.gif)
(2)若
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104081747-33026.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104081747-26913.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104081747-26921.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104081748-56727.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104081735-42779.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104081736-68117.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104081736-43505.gif)
(1)记
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104081736-48809.gif)
(2)若
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104081736-13340.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104081737-71904.gif)
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