已知平面向量
满足
,
与
的夹角为120°,若
,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b172cf8d898883d82e973f28c3c3a3e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7958a6bddd1d578bbd6fbcb92e3f6a3.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/3c7b4450bdce119a17a78d9a239de107.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d33ee1f52775bf9ba66e0fdf0ecbb35.png)
A.1 | B.2 | C.3 | D.4 |
更新时间:2023-04-08 23:19:00
|
相似题推荐
单选题
|
较易
(0.85)
解题方法
【推荐1】已知单位向量
,
的夹角为
,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/9f785147690f83dcee0a0bc6c327e75a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c8a4d21c520f5a154f71b40f8e7ee05.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
单选题
|
较易
(0.85)
名校
【推荐2】已知向量
,
,则下列结论:
①.若
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/323ee865defc540ee01d279d77a6228a.png)
②.若
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ebb8de6464971a443b86cf4ffb09d68.png)
③.若
与
的夹角为
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/383984a28388825c3e0d6b98decacc98.png)
其中正确结论的有( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24f726edf8cca26e1011faa7101c506e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b56f7b7331d7bc66debf192e0f041f3a.png)
①.若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/076559f08d17fb25e82886e791719e52.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/323ee865defc540ee01d279d77a6228a.png)
②.若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7dced91de1b8c38aa95ffee0e5dc202.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ebb8de6464971a443b86cf4ffb09d68.png)
③.若
![](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/ac1a63ab608517bb10aa036783dfb51f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/383984a28388825c3e0d6b98decacc98.png)
其中正确结论的有( )
A.1个 | B.2个 | C.3个 | D.0个 |
您最近一年使用:0次