已知
,
,
与
的夹角为
,则
的值是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06c22fc9f7e478d49b9abfc4bd813902.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/407538138dd68ab917925c2063cc98e9.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/a6c0927afc571a7c966c98192040979e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/684c16e648e1b76fc54ef176f82bf7fc.png)
A.![]() | B.![]() | C.![]() | D.![]() |
更新时间:2023-07-21 08:16:13
|
相似题推荐
单选题
|
较易
(0.85)
名校
解题方法
【推荐1】已知,
为单位向量,且
与
的夹角为
,则
=( )
A.49 | B.19 | C.7 | D.![]() |
您最近一年使用:0次
单选题
|
较易
(0.85)
名校
【推荐2】设
,
是两个不共线向量,则“
与
的夹角为钝角”是“
”的( )
![](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/cb80eb942aafb194fadc473776f35b1d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/433b94c39737727e53468df419d8314a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35325b12aded89037f86f59e57c8c97f.png)
A.充分而不必要条件 | B.必要而不充分条件 |
C.充分必要条件 | D.既不充分也不必要条件 |
您最近一年使用:0次
单选题
|
较易
(0.85)
解题方法
【推荐1】平面内不共线的三个向量
,
,
两两所成的角相等,且
,
,则
( )
![](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/d366d8fbb7258ee051f49977441e14a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8ae0d7b3266f32b6a916b6237b6b838.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6ded8d960b76900c1ed6230ca96126a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a17f1ebbcec8ad4e53fd4e5b4de4cf8a.png)
A.1 | B.2 | C.3 | D.4 |
您最近一年使用:0次
单选题
|
较易
(0.85)
解题方法
【推荐2】已知
,
,
,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/145a7e8f352fab613b773dc6639b508b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87a4fe23b799a0777b2faebd77dd05bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c97772d6d3b3d35851ac48741d19dca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1bd01707e8d32f277b83c007a5b15bd7.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次