已知
是单位向量,且
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d6d343208f0f5e3aab71004c245dabe.png)
__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8ccba3b87a8a48ac3dd5f72d00bdb1a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5759a91508e6600522558561d6b67dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d6d343208f0f5e3aab71004c245dabe.png)
更新时间:2022-02-28 21:11:13
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名校
解题方法
【推荐1】设向量
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您最近一年使用:0次
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较易
(0.85)
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您最近一年使用:0次