将I=∫02dy∫0yf(xdy∫0yf(x,y)dx+∫24dy∫04一yf(x,y)dx改变积分次序后,则I=________.

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问题 将I=∫02dy∫0yf(xdy∫0yf(x,y)dx+∫24dy∫04一yf(x,y)dx改变积分次序后,则I=________.

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答案02dx∫x4一xf(x,y)dy

解析 从原积分可看出积分区域D={(x,y)|0≤x≤2,x≤y≤4一x},则I=∫02dx∫x4一xf(x,y)dy.
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