「(2x-y)^2+y(x-y)」÷8x
[(-x-y)(-x+y)-(x+y)^2-x(y-y^2)}÷1/2y
[x(x-y)-y(x-y)+(x+y)(x-y)]÷2x其中x=2012 y=2013
1.[(x-y)^2-2(y -x)]÷(x-y)
1、x(x-y)(x+y)-x(x+y)^2
「(x²+y²)-(x-y)²+2y(x-y)」÷4y,其中2x-y=18
【2(x-y)^3-8(x-y)^2(x+y)+6y(x-y)^2】/2(x-y)^2=
(1)(x^2/x)-y-x-y
【(x-y)^2+(x+y)(x-y)】除以 2x
[(x+2y)^2 -(x+y)(3x-y)-5y^2]÷2x
计算:(x-y)^7÷(y-x)^6+(-x-y)^3÷(x+y)^2
化简:【(2x-y)(2x+y)+y(y+6x)】÷2x
[(2x+y)(x-3y)+y(x+3y)]÷(2x)计算,