计算(2x^3-3x^2y-2xy^2)-(x^3-2xy^2+y^3)+(-x^3+3x^2y-y^3)
计算:3xy[2xy-x(y-2)+x]
计算4xy+(x-2y)的平方+(x+3y)(3y-x)
计算3xy[2xy-x(y-2)+x-1]
计算(3x^3y-x^2y+1/2xy)÷(-1/2xy)
计算 2xy[4x²y²-3y(xy+x²y)-xy²]
计算:(-7x²y)(2x²y-3xy³+xy)
(x-2xy)*(-xy+2y*y)-(3x*x-2xy)(x-9xy+6y*y)
计算:(x^2-y^2/xy)^2/(x+y)^2*(x/x-y)^3
计算3x[xy-2x(1/y-x/3]+3y(x²-y²)
[x(x^2y^2-xy)-y(x^2-x^3y)]/3x^2y
计算(2x^3-3x^2y-2xy^2)-(x^3-2xy^2+y^3)+(3x^3y-x^3-y^3
(x+y)(x-y)-(2xy+3y)平方