解题方法
1 . 设
是两个不同的平面,
是两条不同的直线,下列命题中真命题的个数是( )
(1)若
,则
;
(2)若
,则
;
(3)若
,则
;
(4)若
,
,则
;
(5)若
,
,
,则
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85412e0569fef68744f32f3fc084b9fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/280860dd039e1305a5ccc455f63e8223.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6a59cb61d21ac9da8940ed8e18c50a0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d6a4c549e7ea8776ec821c467bc1a913.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4ed0b3904c9853f2e97bfb1c8501fd2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80645381feb9746cc149da61d553974a.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/428d3f3dd5edace9275b07da6b8ca482.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5986f2991d45fbf3578f08f27d9fd7e.png)
(4)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df0d37b44de48de51555fa95d94e33f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84b6e422b2e6f6dada4d8c369559a077.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fe920cd78db25f5b4df37d066e57800.png)
(5)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5986f2991d45fbf3578f08f27d9fd7e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fe920cd78db25f5b4df37d066e57800.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a53cd751c44ad4d9ebd8e3243e751321.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84b6e422b2e6f6dada4d8c369559a077.png)
A.1 | B.2 | C.3 | D.4 |
您最近一年使用:0次
解题方法
2 . 如图,已知长方体
中,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ac7d13b959d8b71927121eb529da41b.png)
,点E是
的中点,则异面直线
与
所成角的余弦值为( )
![](https://img.xkw.com/dksih/QBM/2023/6/29/3270194410397696/3274676413661184/STEM/4163071004c64c7289a3d472ed49fc95.png?resizew=111)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ac7d13b959d8b71927121eb529da41b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f656e1d1f68954e5f06de8958f6a9310.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2777840758e70e7dbbc18cef8f3d6d2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ee8456443402a25b1e25d35ff7e1c98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://img.xkw.com/dksih/QBM/2023/6/29/3270194410397696/3274676413661184/STEM/4163071004c64c7289a3d472ed49fc95.png?resizew=111)
A.![]() | B.![]() |
C.![]() | D.![]() |
您最近一年使用:0次