2y(x-y)^2-4y^2(y-x)^3

(x+3y-4)(2x-y) (2x+y)(2x-3y)+x(2y+y) 2a(x-y)-4b(x-y) x/x-y*y^2/x+y-x^3y2/x^4-y^4/x^2/x^2+y^2 {(z+y)(x-y)-(x-y)的2次方+2y(x-y)}除以4y 1.（（y+2x)(-2x+y)+4(x+2y)^2)/3y 2.（2(x-y)^3-8(x-y）^2(x+y)+6y( x^2-y^2/x+y-4x(x-y)+y^2/2x-y, 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) 计算【3(x-y)^2(x+y)^-2/4(x+y)^2(x-y)^-2】^-2 (2x-y)(2x+y)-2(3x-4y)(4y+3x) （x+2)(x+3) (x-4)(x+1) (y+4)(y-2) (y-5)(y-3)