【单选题】
在下列函数中,( )在指定区域内是单调减少的函数
①
<img src=https://huaweicloudobs.ahjxjy.cn/087E58F5FC3F975668C0B235653FCD10.png title={KZ%~M7WDSN86IJUUVMFVK7.png alt={KZ%~M7WDSN86IJUUVMFVK7.png/>
②
<img src=https://huaweicloudobs.ahjxjy.cn/44E8F1CC8CEFD9400C2FFE917B1F2D7D.png title=AX_S_DL_ZW}QZK]}]L`SP{7.png alt=AX_S_DL_ZW}QZK]}]L`SP{7.png/>
③
<img src=https://huaweicloudobs.ahjxjy.cn/743F6FDBC8ECBD9A330B63164AFD4FF7.png title=F_M`]4_A]{N{~J$WD8C(Z9O.png alt=F_M`]4_A]{N{~J$WD8C(Z9O.png/>
④
<img src=https://huaweicloudobs.ahjxjy.cn/7A6F6928A94857244FFE19169BD6C0F3.png title=VECWQKKE81JSICN(}}47RK5.png alt=VECWQKKE81JSICN(}}47RK5.png/>
【单选题】
下列给定区间中是函数<img src=https://huaweicloudobs.ahjxjy.cn/9F41F2144F77B9734834D11F298AE76E.png style=vertical-align: middle;/>的单调有界区间的是
①
<img src=https://huaweicloudobs.ahjxjy.cn/4E0D2D6A0B16D558EB614EF772580355.png style=vertical-align: middle;/>
②
<img src=https://huaweicloudobs.ahjxjy.cn/BE5F5EE234FE689F6670A1882D989361.png style=vertical-align: middle;/>
③
<img src=https://huaweicloudobs.ahjxjy.cn/6CA414105ADBB59F6207CC8A54CE6FC7.png style=vertical-align: middle;/>
④
<img src=https://huaweicloudobs.ahjxjy.cn/B74AF5DE9991AB21FC087659C071C406.png style=vertical-align: middle;/>