已知向量
的夹角为60°,
|,则
____________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64fa2fcefaf3d8868da0cb52877c5247.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a2436ceefe6943b41626fa5ac12aac45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c99c7933c81caf37d0d4665a91ae673b.png)
更新时间:2018-08-22 22:25:27
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