[(2x+y)(2x+y)-(2x+y)(2x-y)]÷2y-0.5y

[(-x-y)(-x+y)-(x+y)^2-x(y-y^2)}÷1/2y 1、x(x-y)(x+y)-x(x+y)^2 [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^2/x)-y-x-y 【(x-y)^2+(x+y)(x-y)】除以 2x x^2-y^2/x+y-4x(x-y)+y^2/2x-y, (x+y)^2(x-y)^2-(x-y)(x+y)(x^2+y^2)分解因式 化简:(x-3y)(x+y)-(x-2y)(x+2y)-(x-y)平方 【x-3y][x+y]-[x-2y][x +2y]-[x-y [(3x+y)(x-y)-(2x+3y)(x-y)]*(x-y) {(z+y)(x-y)-(x-y)的2次方+2y(x-y)}除以4y