计算：（x+2y-32

计算:(-x-2y) * (3x-y) 计算:(x-y)^2*(y-x)^2*(x-y)^6 计算(x+y)(x+y)^2(-x-y)^3 x-y/xy-y^2计算 计算(x²/x+2y)-x+2y-2 计算：(x+y/x-y)÷(xy+x^2) （x^2+xy/x-y)/（xy/x-y)计算 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【3(x-y)^2(x+y)^-2/4(x+y)^2(x-y)^-2】^-2 计算(x-2y)^2-4(2x+y)(y-2x)+4x(y-2) 计算：(x-y)(x+2y)+(2x-y)(2x+y) 计算（2x-3y)(x+4y)-(3x+y)(x-2y)