高数证明题z=y^2/2x+f(xy),f(u)可微,求证:x^2dz/dy-xydz/dy+(3/2)y^2
高等数学证明题z=y^2/2x+f(xy),f(u)可微,求证:x^2dz/dx-xydz/dy+(3/2)y^2=0
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