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[不等式] 高考模拟卷中的数列不等式

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isee posted 2021-4-23 16:04 |Read mode
证明:$n\in \mathrm N^*$,$$1+\frac 3{2^2}+\frac 5{3^2}+\cdots+\frac{2n-1}{n^2}<\frac{2n}{\sqrt{n+1}}.$$

源自 2021届广州数学二模(4月21日),原题在导数第(2)中

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realnumber posted 2021-4-26 16:35
数学归纳法可以证明的,不紧

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敬畏数学 posted 2021-4-26 16:57
法1:返古的套路题。法2:也可以证明和数列为递减。送分啦。

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