已知：x^2 + xy - 6y^2=0,且xy不等于0求2x^2-3xy+y^2/5x^2-7xy+2y^2的值

已知：x^2 + xy - 6y^2=0,且xy不等于0
求2x^2-3xy+y^2/5x^2-7xy+2y^2的值

x^2 + xy - 6y^2=0
化简得（x-2y)(x+3y)=0
x=2y
或x=-3y
分别带入2x^2-3xy+y^2/5x^2-7xy+2y^2化简即可.