计算:【[2/(3x)-2/(x+y)×[(x+y/(3x)-x²-xy)]】÷(x-y)/x
计算:【[2/(3x)-2/(x+y)×[(x+y/(3x)-x²-xy)]】÷(x-y)/x
计算3x[xy-2x(1/y-x/3]+3y(x²-y²)
计算:(x+y/x-y)÷(xy+x^2)
急![(3x+y)²-3(3x-y)(x+y)-(x-3y)(x+3y)]÷(2xy)
(x^2+xy/x-y)/(xy/x-y)计算
计算:(x^2-y^2/xy)^2/(x+y)^2*(x/x-y)^3
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)
计算3x/8y×16y²/27x² (2xy-x²)÷x-2y/xy 2x-6/x
化简:x-y/x+3y÷x^-y^2/x^2+6xy+9y^2-(xy/x+y)
[x(x^2y^2-xy)-y(x^2-x^3y)]/3x^2y
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:[x(x^2y^2-xy)-y(x^2-x^3y)]/3x^2y