计算：y(x-y)^2+(y-x)^3=?

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)+【- 已知x=2+根号3,y=2-根号3,计算代数式(x+y/x-y-x-y/x+y)乘以(1/x^2-1/y^2) 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2x/x^2-y^2 3x/y^2-x^2 y/(x y)(y-x)快! 方程式计算5X-2=Y 4X+3=Y 求X.Y