已知向量
,且
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba3c6bd21d9c27a68b970f446f04d6df.png)
___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/faa4e453cf3a910cc1d82e362cb2fd7c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/076559f08d17fb25e82886e791719e52.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba3c6bd21d9c27a68b970f446f04d6df.png)
更新时间:2022-12-03 07:08:42
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解题方法
【推荐2】已知向
,则
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ec0618ae3a4fde6d6220010af229b9a.png)
________ .
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解题方法
【推荐1】已知
=(2,3),
=(-1,k).若|
=|
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的夹角为钝角,则k的范围为______ .
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/460831eb84926c2cbd3acf47074f4ea8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99d1f4111a0655e2ce6e4913f1a80182.png)
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您最近一年使用:0次
填空题-双空题
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容易
(0.94)
【推荐2】已知向量
,夹角为
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_______ =___________ .
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您最近一年使用:0次