设
是两条不同的直线,
是三个不同的平面,给出下列四个命题:
①若
,则
;②若
,则
;
③若
,则
; ④若
,则
;
其中正确命题有_____________ .(填上你认为正确命题的序号)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/280860dd039e1305a5ccc455f63e8223.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61ba63ad02b1d5af2982fac3d91eb15c.png)
①若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c6f36a604004aa558ef7adf63754caa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a93a52c2b943e4c70ace99ed802d2b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a2fdcaa697aea38b9b743c9b7215dafd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f4ded3c4bc7a2212f2a0eb5f9753de5.png)
③若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de1b9b51eec35ab4b2aa47029a6f505e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5986f2991d45fbf3578f08f27d9fd7e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb0731fec9e82a3f94ca94560576ec74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a93a52c2b943e4c70ace99ed802d2b5.png)
其中正确命题有
2010·安徽安庆·三模 查看更多[2]
更新时间:2016-12-02 20:59:47
|
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解题方法
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