f(x)在〔a,b〕连续,在(a,b)可导,f(a)f(b)>0.f(x)在〔a,b〕连续,在(a,b)可导,f(a)f(b)>0证存在ξ∈(a,b)使〔af(b)-bf(a)〕/a-b=f(ξ)- ξf’(ξ) 如题,
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