名校
解题方法
1 . 已知
、
均为单位向量,且
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25c4799a22ba4fa6d1f26aec7a82ccb7.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64c5562bd4d1b54424330cb6329cd79d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b45ba716f03748c19b7ce2f99af536ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d4a5d782777e0cadbe91b3e10755511.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25c4799a22ba4fa6d1f26aec7a82ccb7.png)
您最近一年使用:0次
解题方法
2 . 已知向量
与
的夹角为
,记
且
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/780acd7f4e23af681ce1aa958a008ec6.png)
_____ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a2f4b1178f68bd147d1a2a6acd04435.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c94075193c11fe43f2396cff5a485054.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d51fc913c4d1fda720563e068ed9695d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8aa43538c4a09e3691a2df4c9549d84.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a36228810d0c2f6c6e53584c1ac176b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/780acd7f4e23af681ce1aa958a008ec6.png)
您最近一年使用:0次