设f(x)在[0,x]上连续,在(0,x)内可导,且f(0)=0,证明：存在ξ∈(0,x),使得f(x)=(1+ξ)f’(ξ)ln(1+ξ).设f(x)在[0，x]上连续，在(0,x)内可导，且f(0)=0,证明：存在ξ∈(0,x),使得f(x)=(1+ξ)f’(ξ)ln(1+x).

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