题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104061559-76039.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104061559-18094.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104061600-98901.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104061559-76039.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104061559-18094.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104061600-64893.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104061600-75171.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104061600-59932.png)
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答案
解析
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104061601-20763.png)
核心考点
试题【设向量与的夹角为,定义与的“向量积”:是一个向量,它的模为.若,,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/20191104/20191104061554-18070.png)
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(1)证明:
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104061555-36176.png)
(2)若点C使得四边形ABCD为矩形,求点C的坐标,并求该矩形对角线所夹的锐角的余弦值.
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104061548-92535.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104061548-27896.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104061549-90590.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104061549-55311.png)
A.300 B.600 C.1200 D.1500
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104061540-35882.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104061540-15332.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104061541-59383.png)
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![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104061541-27279.png)
A.
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104061541-56586.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104061542-25457.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104061542-26076.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104061542-32752.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104061533-76676.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104061533-83006.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104061534-16540.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104061534-64630.png)
A.
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104061534-85802.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104061534-99723.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104061535-54769.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104061535-61841.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104061529-30964.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104061529-64887.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104061529-30964.png)
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