已知x^2+3xy-4y^2=0(y≠0),求x-y/x+y的值.已知x^2+3xy-4y^2=0(y≠0),求x-y/x+y的值.

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已知x^2+3xy-4y^2=0(y≠0),求x-y/x+y的值.已知x^2+3xy-4y^2=0(y≠0),求x-y/x+y的值.
已知x^2+3xy-4y^2=0(y≠0),求x-y/x+y的值.
已知x^2+3xy-4y^2=0(y≠0),求x-y/x+y的值.

已知x^2+3xy-4y^2=0(y≠0),求x-y/x+y的值.已知x^2+3xy-4y^2=0(y≠0),求x-y/x+y的值.
x^2+3xy-4y^2/y^2=0
x/y=-4 or 1
x-y/x+y=5/3 or 0