计算:(x-y)^2/(x+y)÷(y-x)×1/(x-y)
[(-x-y)(-x+y)-(x+y)^2-x(y-y^2)}÷1/2y
1、x(x-y)(x+y)-x(x+y)^2
计算:(x-y)^7÷(y-x)^6+(-x-y)^3÷(x+y)^2
[(2x+y)(x-3y)+y(x+3y)]÷(2x)计算,
计算:(x-y)^2*(y-x)^2*(x-y)^6
计算(x+y)(x+y)^2(-x-y)^3
计算:(-x-2y) * (3x-y)
计算:(x+y/x-y)÷(xy+x^2)
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:1/2x-1/x+y×(x+y/2x-x-y)
计算:1/(2x) - 1/(x+y)((x+y)/(2x) - x - y)
(1)(x^2/x)-y-x-y