已知非零向量
与
的夹角为120°,若
且
则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10da48f465ca081ee5f6dfda4b06b49f.png)
_______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb80eb942aafb194fadc473776f35b1d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/433b94c39737727e53468df419d8314a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e1af7a4215c157d1fa0de0faa1bc985.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dff8dd9b70a146f9f2589228c7e9019f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10da48f465ca081ee5f6dfda4b06b49f.png)
更新时间:2020-03-21 20:24:08
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【推荐1】已知两个单位向量
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您最近一年使用:0次
填空题-单空题
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较易
(0.85)
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解题方法
【推荐2】已知非零向量
,
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___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64c5562bd4d1b54424330cb6329cd79d.png)
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您最近一年使用:0次