名校
解题方法
1 . 若平面向量
与
的夹角为
,
,
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26395c804c0ac41f74cd94b6b23f87ae.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/231b861d6d1f1d0b9f52b041cb40eb62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ccdebcb6b64eb4aa8e919d681ef2db5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ba6bbb689d77e47fdb7040e86c6f2ec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26395c804c0ac41f74cd94b6b23f87ae.png)
您最近一年使用:0次
名校
解题方法
2 . 若正方形ABCD的边长为1,记
,
,
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/621153b6db78aeaf551a11fd1597ec34.png)
___ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e7a93a1399ff7a2bde342652479241b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae60c09521904ab969829bf0d74edd37.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ae641dc1dd68490f30f13f6b64486eb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/621153b6db78aeaf551a11fd1597ec34.png)
您最近一年使用:0次