计算3x[xy-2x(1/y-x/3]+3y(x²-y²)
计算3x[xy-2x(1/y-x/3]+3y(x²-y²)
计算3xy[2xy-x(y-2)+x-1]
计算(1)3x/8y×16y²/27x² (2)(2xy-x²)÷x-2y/xy 2x-6
计算:(-7x²y)(2x²y-3xy³+xy)
计算:(5-xy/x^3-x^2y)/(1-5/xy)^2*(y-x)^3
计算:2x+2y分之3y + x²+xy分之2xy
急![(3x+y)²-3(3x-y)(x+y)-(x-3y)(x+3y)]÷(2xy)
计算 2xy[4x²y²-3y(xy+x²y)-xy²]
计算3x/8y×16y²/27x² (2xy-x²)÷x-2y/xy 2x-6/x
计算:(xy-x²)×x-y/xy
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)