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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m,使
为奇函数;
⑤若
,且
,则
.
其中正确说法的序号是( )
①集合
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4330abe638e1b7c1b1ea9ef080a5900.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84d2e3288e69dc694ed01a6a23c06be5.png)
②若函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb87c830a03204a5b783ad4c2ba49c4e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b92ed9c28b600f6632dbc1f9fb6d5b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c2aa311daf7a73f8c45de4462f9d92b6.png)
③函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f42b2a9736c8943106472a7398d2892.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/862df674d5668eb2c8d67c889866463f.png)
④不存在实数m,使
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d08f6a2dc4b64e82da5dc98a631283b.png)
⑤若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9dbe6c97e2ffd3d4dcd75d138fd95f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ed670b1f668778c6243f3f7470ee7d2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a1d299d50fb38f99d2d1bf73fc714ea9.png)
其中正确说法的序号是( )
A.①③④ | B.②④⑤ | C.②③⑤ | D.①④⑤ |
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