设f(x)在[0,+∞)上连续,单调减少,0〈a〈b,求证a∫(0,b)f(x）dx≤b∫(0,a)f(x)dx

设f(x)在[0,+∞)上连续,单调减少,0〈a〈b,求证a∫(0,b)f(x）dx≤b∫(0,a)f(x)dx 设f‘(x)在[a,b]上连续,且f(a)=0,证明:|∫b a f(x)dx| 设 f(x)在〔a,b〕上具有一阶连续导数,且｜f‘ (x)｜≤M,f(a)=f(b)=0,求证∫(a,b)f(x)dx 设f(x) 在[a,b] 上连续,且f(x)>0.求证:∫(a,b)f(x)dx*∫(a,bdx/f(x)≥(b-a)^ 若f(x)在[a,b]上连续,在(a,b)内可导,|f'(x)|小于等于M,f(a)=0,求证:f(x)dx在[a,b] 设f(x)在[a,b]上连续,且f(x)>0,证明:∫b a f(x)dx*∫b a 1/f(x)dx≥(b-a)^2 设f'(x)在[a,b]上连续,证明:lim(λ→+∞)∫(a,b)f(x)cos(λx)dx=0 设函数f(x)在[a,b]上连续,证明：∫(a→b)f(x)dx=(b-a)∫(0→1)f[a+(b-a)x]dx 设f(x)在区间 [a,b]上连续,证明1/(b-a)∫f(x)dx≤(1/(b-a)∫f²(x)dx)^&# 设f'(x)在[a,b]上连续,且f(a)=0,│∫(a～b)f(x)dx│≤((b-a)^2)/2)max(a≤x≤b 设f(x)在[a,b]上连续,且f(x)＞0,证明：至少存在一点ξ∈(a,b),使得∫f(x)dx=∫f(x)dx.(左 f(x)在[a,b]连续,且f(0)>0,求证 ln[1/(b-a)∫下限a上限bf(x)dx]>[1/(b-a)∫下限