设f(x,y)为连续函数,且f(x,y)=,则f(x,y)=__________.

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问题 设f(x,y)为连续函数,且f(x,y)=,则f(x,y)=__________.

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答案y2+[*]

解析f(x,y)dxdy=A,
    则f(x,y)=y2+Ax,两边积分得
    A=(y2+Ax)dxdy=y2dxdy=x2dxdy
       =1/2(x2+y2)dxdy=1/2∫0dθ∫0ar3dx=
    故f(x,y)=y2+x.
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