1 . 给出下列说法:
①集合
与集合
是相等集合;
②若函数
的定义域为
,则函数
的定义域为
;
③函数
的单调减区间是
;
④不存在实数
,使
为奇函数;
⑤若
,且
,则
.
其中正确说法的序号是
①集合
![](https://img.xkw.com/dksih/QBM/2017/1/9/1619446775095296/1619446775365632/STEM/cd34022523914fba86ff3fa5858afe26.png)
![](https://img.xkw.com/dksih/QBM/2017/1/9/1619446775095296/1619446775365632/STEM/6528e2cbc2b640c69bf8c02cfec55091.png)
②若函数
![](https://img.xkw.com/dksih/QBM/2017/1/9/1619446775095296/1619446775365632/STEM/08db162e7f95477d98e8185ae4dea2b8.png)
![](https://img.xkw.com/dksih/QBM/2017/1/9/1619446775095296/1619446775365632/STEM/037495bc0acb4cc2ab562b95270daa98.png)
![](https://img.xkw.com/dksih/QBM/2017/1/9/1619446775095296/1619446775365632/STEM/58ff37f49e9d4d4285c0eadb9db7b294.png)
![](https://img.xkw.com/dksih/QBM/2017/1/9/1619446775095296/1619446775365632/STEM/7865ddaed09943848cc714c966a6533b.png)
③函数
![](https://img.xkw.com/dksih/QBM/2017/1/9/1619446775095296/1619446775365632/STEM/7081ea1cb6aa4d8785a8e5146cdcf6e9.png)
![](https://img.xkw.com/dksih/QBM/2017/1/9/1619446775095296/1619446775365632/STEM/709eadb73d644a5f90ac18c1b5e800de.png)
④不存在实数
![](https://img.xkw.com/dksih/QBM/2017/1/9/1619446775095296/1619446775365632/STEM/aae2b9c9d85a47168a8f6278cb1f76e2.png)
![](https://img.xkw.com/dksih/QBM/2017/1/9/1619446775095296/1619446775365632/STEM/f0726200c50148f8b82bb4c3d1b3f594.png)
⑤若
![](https://img.xkw.com/dksih/QBM/2017/1/9/1619446775095296/1619446775365632/STEM/e955ed8355234190b66f5d2f0062470e.png)
![](https://img.xkw.com/dksih/QBM/2017/1/9/1619446775095296/1619446775365632/STEM/3c8887c6dadb45d5b360a5fc68430b67.png)
![](https://img.xkw.com/dksih/QBM/2017/1/9/1619446775095296/1619446775365632/STEM/0dabe0d847ea4497bbf4142f4aa81c43.png)
其中正确说法的序号是
A.①②③ | B.②③④ | C.①③⑤ | D.①④⑤ |
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A.①②③ | B.②③④ | C.①③⑤ | D.①④⑤ |