1 3a^3-12a^2+12a2 1/4m^3n-1/4m^2n^2+1/16mn^3

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13a^3-12a^2+12a21/4m^3n-1/4m^2n^2+1/16mn^313a^3-12a^2+12a21/4m^3n-1/4m^2n^2+1/16mn^313a^3-12a^2+12a2

1 3a^3-12a^2+12a2 1/4m^3n-1/4m^2n^2+1/16mn^3
1 3a^3-12a^2+12a
2 1/4m^3n-1/4m^2n^2+1/16mn^3

1 3a^3-12a^2+12a2 1/4m^3n-1/4m^2n^2+1/16mn^3
1.
3a^3-12a^2+12a
=3a(a*2-4a+4)
-3a(a-2)*2
2.
1/4m^3n-1/4m^2n^2+1/16mn^3
=1/4mn(m*2-mn+1/4n*2)
=1/4mn(m-1/2n)*2