Question

求多项式x3次方-3x平方y+3xy平方-y3次方减去多项式x3次方+3x平方y+3xy平方+y3次方的差

Answer 1

x^3-3x^2y+3xy^2-y^2-(x^3+3x^2y+3xy^2+y^2)

=x^3-3x^2y+3xy^2-y^2-x^3-3x^2y-3xy^2-y^2

=-6x^2y-2y^2