已知向量
,
,若
,则k的值为___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2bfe85ddbab55c4ce2dacff821071886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4532d33bd0579fca3a0fadd07a796d59.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f67a1630671c003847d6997e37b7d83.png)
更新时间:2021-10-29 11:12:44
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解题方法
【推荐2】如图,在平行四边形
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_______ .
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