(x-y)(x-y)-(x-2y)(2x+y)化简

化简:(x-3y)(x+y)-(x-2y)(x+2y)-(x-y)平方 1、x(x-y)(x+y)-x(x+y)^2 化简：（2x-y)²-4(x-y)(x+y) (1)(x^2/x)-y-x-y 【(x-y)^2+(x+y)(x-y)】除以 2x {(x,y) |x|+|y| x>y?x:y [(-x-y)(-x+y)-(x+y)^2-x(y-y^2)}÷1/2y 化简(y-x)(z-x)/(x-2y+z)(x+y-2z)+（z-y)(x-y)/(x-2z+y)(y+z-2x)+(x 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 【x-3y][x+y]-[x-2y][x +2y]-[x-y