已知f(x)=,计算: Sn=∫2n2n+2f(x-2n)e-xdx,n=2,3,….

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问题 已知f(x)=,计算:
Sn=∫2n2n+2f(x-2n)e-xdx,n=2,3,….

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答案令x-2n=t,则 Sn=∫2n2n+2f(x-2n)e-xdx=∫02f(t)e-(t+2n)dt=e-2n02f(t)e-tdt=e2n(1-2e-1+e-2)

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