设f(x)=S0=∫02f(x)e—xdx,S1=∫24f(x—2)e—xdx,…,Sn=∫2n2n+2f(x一2n)e—xdx,求Sn.

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问题 设f(x)=S0=∫02f(x)e—xdx,S1=∫24f(x—2)e—xdx,…,Sn=∫2n2n+2f(x一2n)e—xdx,求Sn

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答案S0=∫02f(x)e—xdx=∫01xe—xdx+∫12(2一x)e—xdx=(1一[*]), 令t=x一2,则S1=e—202f(t)e—tdt=e—2S0, 令t=x一2n,则Sn=e—2n02f(t)e—tdt=e—2nS0, S=[*].

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