平面上的单位向量
,
,满足
,则( )
![](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/93940de65765a8d096e6fbad20ec43e6.png)
A.![]() | B.![]() | C.![]() | D.![]() |
更新时间:2020-09-16 20:18:24
|
相似题推荐
单选题
|
较易
(0.85)
名校
【推荐1】已知在三角形
中,
,
,
,
分别为
中点,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ec116b88397a32a09e5f2ddeb564608.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bb5b12692517a39c320f99a479eb055.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b57fdd2a3642716fcf5100011eb3ec88.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3a51949f48ee8cf746851ba779b078e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3355e2fa0ac6c675f02ee36c3ced4f2d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ec116b88397a32a09e5f2ddeb564608.png)
A.4 | B.3 | C.2 | D.1 |
您最近一年使用:0次
单选题
|
较易
(0.85)
解题方法
【推荐2】若
且
,则
与
的夹角是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9dace0389b25651d5e9dbf2c78b23d87.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b4ec31e564f1296f0199d34967b3522.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a2f4b1178f68bd147d1a2a6acd04435.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c94075193c11fe43f2396cff5a485054.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次