1) 8а-12в=4(2a-3b)
2) 3а-ав=a(3-b)
3) 6ах+6аy=6a(x+y)
4) 4a^2+8ac=4a(a+2c)
5 )a^3+a^2=a²(a+1)
6) 12x^2y-3xy=3xy(4x-1)
7) 21a^2b+28ab^2=7ab(3a+4b)
8) -3x^6+12x^12=3x^6(-1+4x^6)=3x^6(4x^6-1)=3x^6(2x³-1)(2x³+1)
9) 4a^2-8a^3+12a^4=4a²(1-2a+3a²)
10) 26x^3-14x^2y+8x^2=2x²(13x-7y+4)
11) 6m^3n^2+9m^2n-18mn^2=
3mn(2m²n+3m-6n)
12) -15a^3b^2c-10a^2b^2c^2-5ab^2c^3=
-5ab²c(3a²+2ac+c²)