∂^2u/∂x∂y=x^2y

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∂^2u/∂x∂y=x^2y
帮忙证明个高数题u=x^2*y^2/(x+y),求证 x*u(x)+y*u(y)=3u

帮忙证明个高数题u=x^2*y^2/(x+y),求证x*u(x)+y*u(y)=3u帮忙证明个高数题u=x^2*y^2/(x+y),求证x*u(x)+y*u(y)=3u帮忙证明个高数题u=x^2*y^

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u=f ( xy,xe^y ) 求 Ә2u / ӘxӘy

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