已知2x^2-3xy-2y^2=0,则x+y/x-y=?

已知2x^2-3xy-2y^2=0,则x+y/x-y=?
已知2x^2-3xy-2y^2=0,则x+y/x-y=?

已知2x^2-3xy-2y^2=0,则x+y/x-y=?
2x^2-3xy-2y^2=0,
（x-2y)(2x+y)=0
x=2y或者 x=-1/2y
分别代入x+y/x-y,得出x+y/x-y=3