求数学大神进(x^2-2xy)·3x^2-(6xy^3-12x^4y^2)÷(-3xy)=?(x^2-2xy)·3x^2-(6xy^3-12x^4·y^2)÷(-3xy)=?

求数学大神进(x^2-2xy)·3x^2-(6xy^3-12x^4y^2)÷(-3xy)=?(x^2-2xy)·3x^2-(6xy^3-12x^4·y^2)÷(-3xy)=?
求数学大神进(x^2-2xy)·3x^2-(6xy^3-12x^4y^2)÷(-3xy)=?
(x^2-2xy)·3x^2-(6xy^3-12x^4·y^2)÷(-3xy)=?

求数学大神进(x^2-2xy)·3x^2-(6xy^3-12x^4y^2)÷(-3xy)=?(x^2-2xy)·3x^2-(6xy^3-12x^4·y^2)÷(-3xy)=?
=3 x^2 (x^2 - 2 xy) + (6 xy^3 - 12 x^4 y^2)/(3 xy)=3 x^4 - 6 x^3y+2 y^2 - 4 x^3 y=3 x^4 - 10 x^3y+2 y^2

12x^4y^2是啥 ？ 输错了吧
=3x^4-6yx^3+2y^2-4yx^3
=3x^4-10yx^3+2y^2