Ответ:

4m²(m-3)=4m³-12m²

-0,4ab(5a+10ab)=-2a²b+4a²b²

7a(a²-2a+3)=7a³-14a²+21a

(a+5)(a-7)=a²+7a-5a-35=a²-2a-35

(3x-1)(2x+7)=6x²+21x-2x-7=6x²+19x-7

(a-1)(a²-2a-1)=a³-2a²-a-a²+2a+1=a³-3a²+a+1