已知x^2+4y^2-2x=4y-2,求(2x-3y)^2-(3y-x)^2的值.

已知2y-x=-3,求[4y(2x-y)-2x(2x-y)]/(2x-y 已知x/y=2,求2x(x+y)-y(x+y)/4x²-4xy+y² 已知x*x-4xy+4y*y=0 求[2x(x+y)-y(x+y)]/(4x*x-4xy+y*y)的值? 已知(x+2y)(2x-3y)=y(y-4x),试求x/y的值 已知:【(x²+y²)-(x-y)²+2y(x-y)】/4y=1,求4x/4x²-y²-1/2x+y 已知x-y=1,求[(x+2y)^2+(2x+y)(x-4y)-3(x+y)(x-y)]除以y的值大神们帮帮忙 已知x-y=1,求[(x+2y)²+(2x+y)(x-4y)-3(x+y)(x-y)]÷y的值 已知x=3分之一,y=-2分之一,求代数式x-(x+y)+(x+2Y)-(x+3y)+(x+4y)...-(x+2009y) 已知x=y+2,求[(x+y)(x-y)-(x-y)的2次方+2y(x-y)]÷4y的值 已知 x-2y=-2 求(2y-x)平方-2x+4y-1 已知4x^2+y^2-4x+4y+5=0,求x,y 已知x+y=4,x^2+y^2=10,求(x-y)^2 已知x^2+y^2=2x+4y求x*y最小值RT 已知x^2+4y^2-4x+8y+8=0,求x+y 已知x+y=4,x^2-y^2=20,求x-y! 已知x+y=4,x^2+y^2=20,求x-y的值 已知xˆ2-yˆ2=24,x+y=4,求x-y 已知3x-4y/2x+y=1/2 求x/y的值