向量
的模为6,它与向量
的夹角为120°,则它在
方向上的投影向量的模为___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a2f4b1178f68bd147d1a2a6acd04435.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/433b94c39737727e53468df419d8314a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c94075193c11fe43f2396cff5a485054.png)
更新时间:2021-08-12 07:07:29
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【知识点】 平面向量数量积的几何意义解读
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