设u=xyf((x+y)/xy),f(t)可微,且满足x^2U'z-y^2U'y=uG(x,y)则G(x,y)=?

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设u=xyf((x+y)/xy),f(t)可微,且满足x^2U''z-y^2U''y=uG(x,y)则G(x,y)=?设u=xyf((x+y)/xy),f(t)可微,且满足x^2U''z-y^2U''y=uG

设u=xyf((x+y)/xy),f(t)可微,且满足x^2U'z-y^2U'y=uG(x,y)则G(x,y)=?
设u=xyf((x+y)/xy),f(t)可微,且满足x^2U'z-y^2U'y=uG(x,y)则G(x,y)=?

设u=xyf((x+y)/xy),f(t)可微,且满足x^2U'z-y^2U'y=uG(x,y)则G(x,y)=?
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