求多项式x^3-3x^y+3xy^2-y^3减去多项式x^3+3x^y+3xy^2+y^3的差jjjjjjjjjjj

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求多项式x^3-3x^y+3xy^2-y^3减去多项式x^3+3x^y+3xy^2+y^3的差jjjjjjjjjjj

求多项式x^3-3x^y+3xy^2-y^3减去多项式x^3+3x^y+3xy^2+y^3的差jjjjjjjjjjj
求多项式x^3-3x^y+3xy^2-y^3减去多项式x^3+3x^y+3xy^2+y^3的差
jjjjjjjjjjj

求多项式x^3-3x^y+3xy^2-y^3减去多项式x^3+3x^y+3xy^2+y^3的差jjjjjjjjjjj
(x^3-3x^y+3xy^2-y^3)-(x^3+3x^y+3xy^2+y^3)
=x^3-3x^y+3xy^2-y^3-x^3-3x^y-3xy^2-y^3
=-6x^y-2y^3

(x^3-3x^y+3xy^2-y^3)-(x^3+3x^y+3xy^2+y^3)
= x^3-3x^y+3xy^2-y^3-x^3-3x^y-3xy^2-y^3
= -6x^y-2y^3
= -2(3x^y+y^3)