设f(x)=∫1xe-t2dt,求∫01x2f(x)dx.

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问题 设f(x)=∫1xe-t2dt,求∫01x2f(x)dx.

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答案01x2f(x)dx=[*]∫01f(x)d(x3)=[*]x3f(x)|01-[*]∫01x3f’(x)dx =[*]∫01x3e-x2dx=[*]∫01te-tdt =[*](te-t01-∫01e-tdt)=[*](2e-1-1).

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