题目
题型:不详难度:来源:
①四边形ABCD是菱形的充要条件是
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105014703-67772.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105014703-98248.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105014703-67772.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105014703-78335.png)
②点G是△ABC的重心,则
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105014703-19954.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105014704-52934.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105014704-58848.png)
③若
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105014703-67772.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105014704-49350.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105014703-78335.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105014704-29999.png)
④若|
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105014703-67772.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105014705-96375.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105014704-29999.png)
其中所有正确命题的序号为 .
答案
解析
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105014703-67772.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105014703-98248.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105014703-67772.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105014703-78335.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105014703-67772.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105014703-98248.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105014703-67772.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105014703-78335.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105014703-19954.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105014704-52934.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105014705-19960.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105014704-49350.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105014705-90449.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105014704-49350.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105014703-67772.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105014704-49350.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105014703-67772.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105014703-78335.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105014704-29999.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105014703-67772.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105014705-96375.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105014704-29999.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105014703-67772.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105014705-96375.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105014704-29999.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105014703-67772.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105014705-96375.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105014704-29999.png)
核心考点
试题【给出以下四个命题:①四边形ABCD是菱形的充要条件是=,且||=||;②点G是△ABC的重心,则++=0;③若=3e1,=-5e1,且||=||,则四边形ABC】;主要考察你对平面向量应用举例等知识点的理解。[详细]
举一反三
(1)求实数x,使两向量
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105014658-20254.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105014658-89743.png)
(2)当两向量
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105014658-20254.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105014658-89743.png)
A.a∥b | B.a⊥b |
C.|a|=|b| | D.a+b=a-b |
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105014648-27915.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105014648-10762.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105014648-45670.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105014632-62263.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105014632-26761.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105014632-73544.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105014632-13573.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105014632-62263.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105014632-26761.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105014632-80151.jpg)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105014626-35547.png)
(1)若
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105014626-63562.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105014626-63562.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105014627-14588.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105014627-43388.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105014627-24913.png)
(2)若向量
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105014627-75322.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105014627-43388.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105014628-94231.png)
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