已知x+2y=0,求分式2xy+y^2/x^2-xy

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已知x+2y=0,求分式2xy+y^2/x^2-xy已知x+2y=0,求分式2xy+y^2/x^2-xy已知x+2y=0,求分式2xy+y^2/x^2-xyx=-2y(2xy+y^2)/(x^2-xy

已知x+2y=0,求分式2xy+y^2/x^2-xy
已知x+2y=0,求分式2xy+y^2/x^2-xy

已知x+2y=0,求分式2xy+y^2/x^2-xy
x=-2y
(2xy+y^2)/(x^2-xy)
=(-4y^2+y^2)/(4y^2+2y^2)
=-3y^2/(6y^2)
=-1/2