1.6a^3-8a^2-4a 2.-x^3y^3-2x^2y^2+xy3.ma-mb+m^2+mn+na+nb

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1.6a^3-8a^2-4a 2.-x^3y^3-2x^2y^2+xy3.ma-mb+m^2+mn+na+nb
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1.6a^3-8a^2-4a 2.-x^3y^3-2x^2y^2+xy3.ma-mb+m^2+mn+na+nb
1.6a^3-8a^2-4a
2.-x^3y^3-2x^2y^2+xy
3.ma-mb+m^2+mn+na+nb

1.6a^3-8a^2-4a 2.-x^3y^3-2x^2y^2+xy3.ma-mb+m^2+mn+na+nb
1.2a(3a^2-4a-2)
2.-(x^3y^3+2x^2y^2-xy )
=-xy(x^2y^2+2xy-1)