设f(x)在[0,1]上连续且递减,证明:当0<λ<1时,∫0λf(x)dx≥λ∫01f(x)dx.

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问题 设f(x)在[0,1]上连续且递减,证明:当0<λ<1时,∫0λf(x)dx≥λ∫01f(x)dx.

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答案因f(x)在[0,1]上连续,由定积分的可加性和积分中值定理知 [*] 又0<λ<1,f(x)在[0,1]上递减,则0<1-λ<1,f(ξ)>f(η), 因此λ(1-λ)[f(ξ)-f(η)]≥0,故∫0λ≥λ∫01f(x)dx.

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