1 . 无论
,
,
同为三条不同的直线还是同为三个不同的平面,给出下列说法:
①若
,
,则
;
②若
,
,则
;
③若
,
,则
;
④若
与
无公共点,
与
无公共点,则
与
无公共点;
⑤若
,
,
两两相交,则交点可以有一个,三个或无数个.
其中说法正确的序号为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e81e59019989b7dc2fb59b037ef6e010.png)
①若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d77fa66cb84828301a0cac235a43d70a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95bb0a8369aa7f9ee31e7dba1af64529.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc5ae05de7ab1640bf15de25b8e3503b.png)
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32f849e1276336a0acbabff8d0994d49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bd9fa99f51ca296c8f0ed6b9780adc0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d49bd8dd3f7797fdd4b0bb1104d61aa.png)
③若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32f849e1276336a0acbabff8d0994d49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc5ae05de7ab1640bf15de25b8e3503b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bd9fa99f51ca296c8f0ed6b9780adc0.png)
④若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e81e59019989b7dc2fb59b037ef6e010.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e81e59019989b7dc2fb59b037ef6e010.png)
⑤若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e81e59019989b7dc2fb59b037ef6e010.png)
其中说法正确的序号为( )
A.①③ | B.①③⑤ | C.①③④⑤ | D.①④⑤ |
您最近一年使用:0次
2 . 已知命题:“若
,则
”为真命题,那么字母
在空间所表示的几何图形:①都是直线;
②都是平面;
③
是直线,
是平面;
④
是平面,
是直线.
其中正确结论的序号为___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4f04d04906af75cb9df8b9800d9b286.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bd9fa99f51ca296c8f0ed6b9780adc0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a14c388e1e2e5a2ff1ccf6caffbee0d.png)
②都是平面;
③
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b0fffbec1fe851795dfdd448bf0d165.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e81e59019989b7dc2fb59b037ef6e010.png)
④
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e026ac41c5502a4743b336845bae2d95.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
其中正确结论的序号为
您最近一年使用:0次