已知向量
, 则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8ef55542504e8d147448cbfb6eaad7a.png)
_________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e8b044a83bf64cbc828630ca4636814.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8ef55542504e8d147448cbfb6eaad7a.png)
更新时间:2023-03-25 19:38:26
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