已知X^2-6x+|y+1|=0,求(x+2y)^2(x-2y)^2-(x+2y)(x^2+4y^2)(x+2y)的值
已知x*x-4xy+4y*y=0 求[2x(x+y)-y(x+y)]/(4x*x-4xy+y*y)的值?
已知4x=9y求(1)x+y/y (2)y-x/2x
1、x(x-y)(x+y)-x(x+y)^2
已知X-Y/X+Y=3,求代数式2(x-y)/X+Y-3X+Y/X+Y
已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y)
已知X.x+y.y-4x+2y+5=0,求4X.X-12X Y+9Y.y的值
已知:4x^2+y^2-4x-6y+10=0,求y/x-x/y的值
已知2/x+2/y=根号24,求 x/y(x-y) - y/x(x-y)的值
已知2/x 2/y=根号24,求 x/y(x-y) - y/x(x-y)的值
已知:x+2y=2011 求代数式{(x^+y^)-(x-y)^+2x(x+y)}/2x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-y/x=x/x-2y(y不等于0),求x:y的值