已知向量
,
,向量
与向量
的夹角为
,则
=_________ ;
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68f8ec049c5a608c3f2d3a05534e93c4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd7bbcb43908eb5cc19338da3b40854b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/969604545902c9a66549a4a44ec3a3c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90ab17fd4247cdd710c363d5d3fbc5bd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d5bca00fa20e6e80480b9d06d2e52ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8dde5e69937df2b1e695474098eb5228.png)
更新时间:2019-05-06 16:04:40
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【知识点】 平面向量数量积的运算
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容易
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解题方法
【推荐1】在
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填空题-单空题
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容易
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名校
【推荐2】在边长为
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