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[函数] 导数与不等式结合的综合小题

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走走看看 posted 2019-8-4 16:59 |Read mode
Last edited by 走走看看 2019-8-4 17:48设函数$f(x)=xe^x$,关于x的不等式$[f(x)]^2-(a+2)f(x)+2a≤0$有且仅有两个整数解,则a的取值范围是( )。

$A.[-2,0]   B.[0,2]    C.[e,2e^2]    D.[2e^2,3e^3)$

感觉好像是C。因式分解后,如何分析呢?

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kuing posted 2019-8-4 17:29
想一下 f(x) 的图象就完了,应该是 `[2e^2,3e^3)`

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kuing posted 2019-8-4 17:34
类似的题:forum.php?mod=viewthread&tid=6041 的题目2

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original poster 走走看看 posted 2019-8-4 21:57
回复 3# kuing


    很好,谢谢!

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