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[函数] 模考压轴

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exctttt posted 2023-4-22 13:27 |Read mode
Last edited by exctttt 2023-4-27 23:35$f(x)$ 为定义在 $[0,1]$ 上的非负函数,$f(0)=0,f(1)=1$ ,若对于任意的 $x_1,x_2$ 使得 $x_1,x_2,x_1+x_2\in[0,1]$,有 $f(x_1)+f(x_2)\le f(x_1+x_2)$ 恒成立,求证:$f(x)\le2x$.

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kuing posted 2023-4-22 14:14
《撸题集》P.564 题目 4.8.15.

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isee posted 2023-4-22 23:12
哪里的?
isee=freeMaths@知乎

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facebooker posted 2023-4-23 15:53
同问 用函数不等式压轴 胆子不小

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original poster exctttt posted 2023-4-27 23:33
kuing 发表于 2023-4-22 14:14
《撸题集》P.564 题目 4.8.15.

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original poster exctttt posted 2023-4-27 23:34
题源:济南二模

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