已知向量
.若
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6c57bbef89a37f1a3808c0ceeac0c22.png)
________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a1fc54194af6a3ca8a8cd5b0bd11379.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc28ab5fb98f7741bd38d6b066a917f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6c57bbef89a37f1a3808c0ceeac0c22.png)
更新时间:2023-10-07 09:46:23
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