设f(x)连续,则∫0xtf(x—t)dt=_______.

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问题 设f(x)连续,则0xtf(x—t)dt=_______.

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答案f(x)

解析 由∫0xtf(x一t)dtx0(x一u)f(u)(一du)=x∫0xf(u)du—∫0xuf(u)du得

=∫0xf(u)du+xf(x)一xf(x)=∫0xf(u)du,
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