已知
,
,
均为平面单位向量,且两两夹角为120°,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26d69ec00311ecffeff107753e064ad8.png)
____ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a2f4b1178f68bd147d1a2a6acd04435.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c94075193c11fe43f2396cff5a485054.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d366d8fbb7258ee051f49977441e14a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26d69ec00311ecffeff107753e064ad8.png)
更新时间:2024-05-23 09:15:04
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