已知向量
,
,若
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8ef55542504e8d147448cbfb6eaad7a.png)
__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fa8fa01762114a733f1bf8f82310803e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a06f0cf15d22b9c43c45ac1d5d394ef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7dced91de1b8c38aa95ffee0e5dc202.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8ef55542504e8d147448cbfb6eaad7a.png)
更新时间:2023-04-12 16:35:39
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【推荐1】与向量
方向相反的单位向量是________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a2e8102c7b25df11719d3a94953e35e6.png)
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【推荐2】已知向量
,
,若
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/373e76e807cea3f42e64fd6f87e6f8b7.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd40fa8aea69604b2d304306db4db427.png)
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您最近一年使用:0次
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【推荐1】在
中,三个内角
,
,
所对的边分别为
,
,
,已知
,
,且
,角![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1f9fabbbe61a759e52ec975215e2e7c.png)
________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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【推荐2】已知向量
,
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a2e8102c7b25df11719d3a94953e35e6.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
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