1 . 设
,
,
,
,
是一组平面向量,记
,若向量
,且
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f3cb8d72bb2e281b943b3b430138ef7.png)
_________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f093c61867ee4ce75f951d46b9b123.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ae3e7b4da62e064dc4afc758834ad3e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c831a7bd74a6ee2776f76b774c4fecd5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/daa5e9bd516f6282483b92cfe6074623.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb7afa22369cf1ba281623b7b99c5ff9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/819d065f000538b7f61abd23307ff516.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a868d7ab435f06d015dc5dee1803723.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0f0aada669072fbe7c61a50d06c1a6b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f3cb8d72bb2e281b943b3b430138ef7.png)
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2022-03-09更新
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