已知向量
满足
,则向量
与
夹角的余弦值为_____ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b172cf8d898883d82e973f28c3c3a3e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d48fa8e77a33ed20471e84cd67ed038b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a2f4b1178f68bd147d1a2a6acd04435.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c94075193c11fe43f2396cff5a485054.png)
更新时间:2016-12-03 13:54:42
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适中
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【推荐1】四边形
中,
,
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【推荐2】已知向量
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,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc009cdbdb648e63e75034b9763e1e79.png)
__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8ccba3b87a8a48ac3dd5f72d00bdb1a.png)
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适中
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【推荐1】设平面向量
与
的夹角为
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,
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的取值范围为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb80eb942aafb194fadc473776f35b1d.png)
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【推荐2】我们把由平面内夹角成
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分别为
正方向上的单位向量,若向量
,则把实数对
叫做向量
的“@未来坐标”,记
,已知
,
分别为向量
,
的“@未来坐标”,若向量
,
的“@未来坐标”分别为
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(0.65)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3cbc5e292e378e35f3d579839497b2eb.png)
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_____ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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