解题方法
1 . 下列命题中正确命题的序号为___________
①函数
与直线x=l的交点个数为0或l;
②![](https://img.xkw.com/dksih/QBM/2015/12/3/1572340280983552/1572340286595072/STEM/21361760704748ffb1e4dac785797436.png?resizew=13)
,+∞)时,函数
的值域为R;
③R上奇函数
满足
,
<
时,
,则
;
④与函数
关于点(1,-1)对称的函数为
.
①函数
![](https://img.xkw.com/dksih/QBM/2015/12/3/1572340280983552/1572340286595072/STEM/6b8b4699af0b45e7b95416b55772d6af.png?resizew=61)
②
![](https://img.xkw.com/dksih/QBM/2015/12/3/1572340280983552/1572340286595072/STEM/21361760704748ffb1e4dac785797436.png?resizew=13)
![](https://img.xkw.com/dksih/QBM/2015/12/3/1572340280983552/1572340286595072/STEM/620c6863d3c94c0f9b7825d03cd5b914.png?resizew=33)
![](https://img.xkw.com/dksih/QBM/2015/12/3/1572340280983552/1572340286595072/STEM/d22c1ca84fb74989a7acdc4559efaebf.png?resizew=119)
③R上奇函数
![](https://img.xkw.com/dksih/QBM/2015/12/3/1572340280983552/1572340286595072/STEM/844ca40ed4544f3a8b84335d881ef251.png?resizew=34)
![](https://img.xkw.com/dksih/QBM/2015/12/3/1572340280983552/1572340286595072/STEM/1d5fead9790646a9b3308afee32074f8.png?resizew=102)
![](https://img.xkw.com/dksih/QBM/2015/12/3/1572340280983552/1572340286595072/STEM/334394e210ac4276b4febad1ae780544.png?resizew=11)
![](https://img.xkw.com/dksih/QBM/2015/12/3/1572340280983552/1572340286595072/STEM/9e7c820a26134127b5ca13a0434de221.png?resizew=32)
![](https://img.xkw.com/dksih/QBM/2015/12/3/1572340280983552/1572340286595072/STEM/10ebf05cf8f7421184e914f9ead1ca60.png?resizew=66)
![](https://img.xkw.com/dksih/QBM/2015/12/3/1572340280983552/1572340286595072/STEM/a2c7e20aaa7e4a138d5dcab55d231aed.png?resizew=91)
④与函数
![](https://img.xkw.com/dksih/QBM/2015/12/3/1572340280983552/1572340286595072/STEM/e5f37bcc95584199a096b7bcd3b14ec8.png?resizew=82)
![](https://img.xkw.com/dksih/QBM/2015/12/3/1572340280983552/1572340286595072/STEM/3bb023c9d3c5497ea00dd602cc9c8df8.png?resizew=90)
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