设f(x)在[0,1]内连续递减 0

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设f(x)在[0,1]内连续递减 0

设f(x)在[0,1]内连续递减 0
设f(x)在[0,1]内连续递减 0

设f(x)在[0,1]内连续递减 0
因为f(x)递减
所以[a,1]内f(x)的积分/1-a