下列函数中,既是偶函数,又在
上单调递减的是___________ .(填写正确结论的序号)
①
;②
;③
;④
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/189b2da6c420bf8f8900002d14f65f72.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86f2d2eb3a46f9d6658e3a4360f73dad.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d1c7565a2508c2a3bb2c85921175265.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8dbca1af9f0fe13afc4aa13ab62c0c6e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/572f286fb45b2757af63569ae0bc2e99.png)
更新时间:2022-10-06 09:13:05
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②
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