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设f(x)在[0,1]上连续且单调减,试证对任何a∈(0,1)有 ∫0af(x)dx≥a∫01f(x)dx
设f(x)在[0,1]上连续且单调减,试证对任何a∈(0,1)有
∫0af(x)dx≥a∫01f(x)dx
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设f(x)在[0,1]上连续且单调减,试证对任何a∈(0,1)有
∫0af(x)dx≥a∫01f(x)dx
设f(x)在[0,2π]上单调减且分段连续,试证∫02πf(x)sinnxdx>0(n是自然数).
试证明柯西积分判别法
设f(x)在x≥1上非负、连续且单调减,则级数∑n=1+∞f(n)与广义积分∫1+∞f(x)dx同敛散.
设f(x)在[0,1]上连续且f(x)≥a>0,
试证 ∫01Inf(x)dx≤Inf∫01f(x)dx.
设f(x)在[0,1]上连续,f(0)=3,且对于[0,1]上的一切x和y,有
|f(x)-f(y)|≤|x-y|,试估计积分的值
设函数f(x)在区间[0,1]上连续,在(0,1)内可导,且满足条件试证:存在ξ∈(0,1),使f(ξ)+ξf'(ξ)=0