名校
解题方法
1 . 如图,在正方体
中,E为
的中点﹐F为
的中点,O为上底面
的中心,则异面直线EF与OB所成的角的大小为( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/1/ba166e18-ae49-449c-84be-4db8ad31b968.png?resizew=150)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/394c5d2f55221975503be8aa18022480.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2777840758e70e7dbbc18cef8f3d6d2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/632f2bf1cd0435041fa04b01901d1c8c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/1/ba166e18-ae49-449c-84be-4db8ad31b968.png?resizew=150)
A.30° | B.45° | C.60° | D.120° |
您最近一年使用:0次
2020-12-20更新
|
172次组卷
|
3卷引用:广西崇左高级中学2020-2021学年高二11月月考数学试题
2 . 在长方体
中,若
,
,则异面直线
和
所成角的余弦值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/47873e89e645a09b22b5374c27a18e78.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f4aca5534bce25acaeb7379deed8f8f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f1f229274a6e17977cc047814212589.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b470c4e195cf7a07b7a331ce4b436e03.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次