帮忙化简下(2x+y)^2-(2x+y)(x-y)-2(x-2y)(x+2y)

1、x(x-y)(x+y)-x(x+y)^2 帮忙化简下(2x+y)^2-(2x+y)(x-y)-2(x-2y)(x+2y) (1)(x^2/x)-y-x-y 【(x-y)^2+(x+y)(x-y)】除以 2x (x+2y)²-2（x-y)(x-y)+2y(x-3y)帮忙化简下,准确一点哦, [(-x-y)(-x+y)-(x+y)^2-x(y-y^2)}÷1/2y 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) 有这样一道题:"计算(2*x*x*x-3*x*x*y-2*x*y*y)-(x*x*x-2*x*y*y+y*y*y)+【-