x^2+{(3y-2)-(2y-3)}x-(3y-2)(2y-3)=(x+3y-2)(x-2y+3)

已知X-Y/X+Y=3,求代数式2(x-y)/X+Y-3X+Y/X+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) 已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(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)+【- 【2(x-y)^3-8(x-y)^2(x+y)+6y(x-y)^2】/2(x-y)^2= 计算(x+y)(x+y)^2(-x-y)^3 数学(x-y)^5*(y-x)^3*(x-y)^2 (x-y)^2-(x-y)^3因式分解 计算:(-x-2y) * (3x-y) (x+y)^2-3(x-y)因式分解