6X^2+7XY-5Y^2=0(Y≠0),则X/Y=__如果有回答合乎情理的我会适当给分,^2就是平方的意思
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5x^2-7xy-6y^2=0
x^2-4xy+5y^2+6y+9=0,x+y=
已知x+y=2xy,且xy不等于0,则求-2x+6xy-2y/(7x+5y)-9xy-(3x+y)=___
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解二元二次方程组:6x^2-5xy+y^2=0 ,x^2+xy+y^2=7
解二元二次方程组:6x^2-5xy+y^2=0 ,x^2+xy+y^2=7
若(x*x+y*y)(x*x+y*y)-4x*x*y*y=0,求代数式(x*x+5xy+y*y)/(x*x+2xy+y*y)的值
5x^2+7xy+6y^2=0求x/y
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