设函数f(x)在区间[0,1]上连续,且∫01f(x)dx=A,求∫01dx∫x1f(x)f(y)dy.

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问题 设函数f(x)在区间[0,1]上连续,且∫01f(x)dx=A,求∫01dx∫x1f(x)f(y)dy.

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答案01x1f(x)f(y)dy=∫01dy∫0yf(x)f(y)如 (交换积分次序) =∫01dx∫0xf(y)f(x)dy (积分值与积分变量使用的字母无关), 故 ∫01dx∫x1f(x)f(y)dy=[*]∫01dx∫x1f(x)f(y)dy+[*]∫01dx∫x1f(x)f(y)dy =[*]∫01dx∫x1f(x)f(y)dy+[*]∫01dx∫0xf(x)f(y)dy =[*]∫01dx∫01f(x)f(y)dy=[*]∫01f(x)dx∫01f(y)dy=[*]A2

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