(2X+Y)(X-2Y)-2X(X+Y)化简

1、x(x-y)(x+y)-x(x+y)^2 化简:(x-3y)(x+y)-(x-2y)(x+2y)-(x-y)平方 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 化简(y-x)(z-x)/(x-2y+z)(x+y-2z)+（z-y)(x-y)/(x-2z+y)(y+z-2x)+(x 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)+【- 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：{2/3x-2/(x+y)[(x+y)/3x-x-y]}/【(x-y)/x】的负二次方 【x-3y][x+y]-[x-2y][x +2y]-[x-y [(3x+y)(x-y)-(2x+3y)(x-y)]*(x-y)