计算【2+3x-y】【3x+y-2】-【2-3x-y】【3x+y-2】

计算:(-x-2y) * (3x-y) 计算(x+y)(x+y)^2(-x-y)^3 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)+【- 计算2x/x^2-y^2 3x/y^2-x^2 y/(x y)(y-x)快! 计算【3(x-y)^2(x+y)^-2/4(x+y)^2(x-y)^-2】^-2 计算（2x-3y)(x+4y)-(3x+y)(x-2y) [(2x+y)(x-3y)+y(x+3y)]÷(2x)计算, (x-3y)(y+2x)-(4y-3x)(3x+4y)计算 计算：(y-x)^3(x-y)^m-(x-y)^m+2(y-x) 计算：(x-y)^7÷(y-x)^6+(-x-y)^3÷(x+y)^2 计算(x^8-x^7y+x^5y^3-x^4y^4+x^3y^5-x^y^7+y^8)(x^2+xy+y^2) [(3x+y)(x-y)-(2x+3y)(x-y)]*(x-y)