若2x^2-6xy+9y^2-4x+4=0,则y/x-x/y=
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*
已知x*x-4xy+4y*y=0 求[2x(x+y)-y(x+y)]/(4x*x-4xy+y*y)的值?
已知3x^2+xy-2y^2=0,求{(x+y)/(x-y)+4xy/(y^2-x^2)}/{(x+3y)*(x-y)}
若x+y=-1,则x^4+5x^3y+x^2y+8x^2y^2+xy^2+5xy^3+y^4=( )
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/y=2,求2x(x+y)-y(x+y)/4x²-4xy+y²
若4x²+4xy+2y²+6y+9=0,则x-y=_____
2 21.(2x+3y) -(x+2y) 2 2 2 22.3|x-3|+x -6xy+9y =0 则x y+2xy=?
若x、y满足2x的平方-6xy+9y的平方-4x+4=0,则y的x次方=
A=2x²-3xy+y²-x+2y,B=4x²-6xy+2y²+3x-y,若x=
7.X*X+2X+Y*Y-6Y+10=0,则xy=?
设A=2x²-3xy+y²-x+2y,B=4x²-6xy+2y²-3x-y,若x