设D={(x,y)|x2+y2≤2x,0≤y≤x},且f(x,y)=x2-f(x,y)dxdy,则f(x,y)dxdy=________.

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问题 设D={(x,y)|x2+y2≤2x,0≤y≤x},且f(x,y)=x2-f(x,y)dxdy,则f(x,y)dxdy=________.

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