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[函数] 比较大小

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ym2025 posted 2022-3-3 09:11 |Read mode
(2022 届郑州外国语中学调研二, 10 ) $a=\dfrac{3 \times(2-\ln 3)}{\mathrm{e}^{2}}$, $b=\dfrac{1}{\mathrm{e}}$, $c=\dfrac{\ln 3}{3}$, 则 $a, b, c$ 的大小顺序。   b最大根据函数的单调性,比较$a$和$c$的大小,参考答案证明极值点偏移的方法,那样做,稍微有点复杂,有没有简单的办法。

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战巡 posted 2022-3-3 13:50
Last edited by hbghlyj 2025-5-15 17:48回复 1# ym2025


有啊,那就是背出这几个数的具体大小
$2.718<e<2.719$,$1.098<\ln(3)<1.099$,剩下就是纯计算的事了

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