已知平面向量
满足
,
,若
,则
的夹角的余弦值为____________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2e8398ec2a562ac76d5cf9838fbd44d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/911d43d09d64f55058b954427b1783f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c3a14b6bc78b6dc6323a39e41bd32df.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3ec342f3ca1aa6b6623715072868754.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2e8398ec2a562ac76d5cf9838fbd44d.png)
更新时间:2018-12-05 16:37:08
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【推荐1】已知向量
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填空题-单空题
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