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[函数] 请教一道导数题

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yueyeill Posted 2023-1-17 15:28 From mobile phone |Read mode
Last edited by hbghlyj 2025-3-29 02:38一道导数题,第二问没有什么思绪,各位有时间可以看看.
22.(12 分)
已知函数 $f(x)=x^2 \mathrm{e}^{a-x}-a^2 \ln x-a$ 有三个零点 $x_1, x_2, x_3\left(x_1<x_2<x_3\right)$ .
(I)求 $a$ 的取值范围;
(II)记 $f(x)$ 的极值点为 $x_4, x_5$ ,证明:$f\left(x_4\right)+f\left(x_5\right)>0$ .

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 Author| yueyeill Posted 2023-1-17 15:36 From mobile phone
第一问算出来a的范围是(0,1)

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 Author| yueyeill Posted 2023-1-19 22:10 From mobile phone
有大佬写写么 挺高质量的,类似于最近长郡的一道🔥的偏移题fx1+fx2>2m 不🎣

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