1) -4а^3(3а+1)(1-3а)= -4а^3(1+3а)(1-3а)= -4а^3*(1-9а^2)= -4а^3+36а^5
2) (а^6-b^6)(a^12+b^12)(a^6+b^6)= (a^12-b^12)*(a^12+b^12)= a^24-b^24
