1 . 已知
,
,且
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e99db28b7a5a1b437b943e7f9ad9f894.png)
_________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8da3cb36a7016be2eabf754ec62c7ce9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9185d7d5a6e4dc3935cbc28ffa5d49d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa5aa846a5b7c96fe2ce665eb1ea5f0e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e99db28b7a5a1b437b943e7f9ad9f894.png)
您最近一年使用:0次
解题方法
2 . 已知向量
,
,若
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ecd08cfa103788811e6d78f326e1d5cf.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3576ad2d3acf6136df34f6277d0607f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/327f6f39a8af4fb099018d003c55b0d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53b030ff1967682591d1408f06ca71bd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ecd08cfa103788811e6d78f326e1d5cf.png)
您最近一年使用:0次