已知x^2-2xy+2y^2+6x-6y+9=0求x y
已知xy=-2,x-y=3,求(x+y)(x-y)-y^2+(x-y)^2-(6x^2y-2xy^2)÷2y
已知x*x-4xy+4y*y=0 求[2x(x+y)-y(x+y)]/(4x*x-4xy+y*y)的值?
已知xy=-2,x-y=3,求(x+y)(x-y)-y²+(x-y)²-(6x²y-2xy
已知:x/y=-2,求x^2-2xy-3y^2/x^-6xy
已知4x^2+y^2-4xy-12x+6y+9=0,求x,y的关系
已知x²+y²-2xy-6x+6y+9=0,求x+y的值
已知x²+y-2xy-6x+6y+9=0,求x-y的值
已知x.x+y.y+8x+6y+25=0,求代数式(x.x-4y.y)/(x.x+4xy+4y.y)-x/(x+2y)的
已知x>0,y>0,且x+6y=5根号xy,求(2x+根号xy-y)分之(x+根号xy+2y)的值
已知xy/x+y=6,求3x-2xy+3y/-x+3xy-y的值.
已知x-3y=0,求[(2x+6)/(x^2-2xy+y^2)]*(x-y)的值.
已知xy=2,x-y=3,求(x+y)(x-y)-y^2-(6x^2y-2xy^2)/2y的值.