已知
,下列四个结论正确的序号是______ .
①函数
在区间
上是减函数;
②点
是函数
图象的一个对称中心;
③函数
的图象可以由函数
的图象向左平移
个单位长度得到;
④若
,则
的值域为
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25158de704d2259fec334fc22e51f90e.png)
①函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98fc67cc39a2b6857e45308d37ea4107.png)
②点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/656d567ad105c13e222bc2d4c92f9be3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
③函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0915075cb1303fcbd677567d1c0b47bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15615de1a6df206dbd081251f676578e.png)
④若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb48434bdcafb5e084fc0b6396cb9469.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70aa83a53d924ee21a5408a796a93774.png)
更新时间:2023-03-24 11:02:36
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