x^2+xy-2y^2=0,求3x-y/x+y的值
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x^2+xy-2y^2=0,求3x-y/x+y的值
![x^2+xy-2y^2=0,求3x-y/x+y的值](/uploads/image/z/19696964-68-4.jpg?t=x%5E2%2Bxy-2y%5E2%3D0%2C%E6%B1%823x-y%2Fx%2By%E7%9A%84%E5%80%BC)
x^2+xy-2y^2=(x+2y)(x-y)=0
so x=y or x=-2y
if x=y
(3x-y)/(x+y)=(3y-y)/(y+y)=1
if x=-2y
(3x-y)/(x+y)=(-6y-y)/(-2y+y)=7
so x=y or x=-2y
if x=y
(3x-y)/(x+y)=(3y-y)/(y+y)=1
if x=-2y
(3x-y)/(x+y)=(-6y-y)/(-2y+y)=7
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