高中数学代数与函数一函数练习题84
题目内容

对于定义域为 http://picflow.koolearn.com/upload/2013-03/18/d56df974-805b-4b56-ab43-71d01c0bafde/paper.files/image085.png的函数 http://picflow.koolearn.com/upload/2013-03/18/d56df974-805b-4b56-ab43-71d01c0bafde/paper.files/image086.png和常数 http://picflow.koolearn.com/upload/2013-03/18/d56df974-805b-4b56-ab43-71d01c0bafde/paper.files/image087.png,若对任意正实数 http://picflow.koolearn.com/upload/2013-03/18/d56df974-805b-4b56-ab43-71d01c0bafde/paper.files/image088.pnghttp://picflow.koolearn.com/upload/2013-03/18/d56df974-805b-4b56-ab43-71d01c0bafde/paper.files/image089.png使得 http://picflow.koolearn.com/upload/2013-03/18/d56df974-805b-4b56-ab43-71d01c0bafde/paper.files/image090.png恒成立,则称函数 http://picflow.koolearn.com/upload/2013-03/18/d56df974-805b-4b56-ab43-71d01c0bafde/paper.files/image086.png为“敛 http://picflow.koolearn.com/upload/2013-03/18/d56df974-805b-4b56-ab43-71d01c0bafde/paper.files/image087.png函数”.现给出如下函数: ① http://picflow.koolearn.com/upload/2013-03/18/d56df974-805b-4b56-ab43-71d01c0bafde/paper.files/image091.png;             ② http://picflow.koolearn.com/upload/2013-03/18/d56df974-805b-4b56-ab43-71d01c0bafde/paper.files/image092.png; ③ http://picflow.koolearn.com/upload/2013-03/18/d56df974-805b-4b56-ab43-71d01c0bafde/paper.files/image093.png;               ④ http://picflow.koolearn.com/upload/2013-03/18/d56df974-805b-4b56-ab43-71d01c0bafde/paper.files/image094.png. 其中为“敛1函数”的有

2021-08-04

A.①②

B.③④

C.②③④

D.①②③

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