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已知f〞(x)＜0，f(0)＝0，试证：对任意的两正数x1和x2，恒有f(x1＋x2)＜f(x1)＋f(x2)成立．

A.
【参考答案】

令F(x)＝f(x＋x2)－f(x)－f(x2)则Fˊ(x)＝fˊ(x＋x......

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