19-20高一·全国·课后作业
解题方法
1 . 设平面向量
,且
与
不共线.求证:向量
与
垂直.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90ced2d4456c3c83e8878a83504bc485.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a2f4b1178f68bd147d1a2a6acd04435.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c94075193c11fe43f2396cff5a485054.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0983b4417f7386eda3a5ef7b5a14653b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1bca35e52b8430246a1cf96e9e617cce.png)
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2 . 已知
,则
=_____ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8acfe18b4092a5f17e4a24e1b9839e60.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18f909a9b01bd3a91975f48db293fa00.png)
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