Упростите выражение: а) (a-2)(a^2+a-1)-a^2(a-1) б) (3-p)(9+3p+p^2)-(1-p^3)

Question

Упростите выражение:
а) (a-2)(a^2+a-1)-a^2(a-1)

б) (3-p)(9+3p+p^2)-(1-p^3)

Answer 1

A) a^3-2^3-a^3+a²=a²-8

b) 3^3-p^3-1+p^3=27-1=26

Answer 2

A)(a-2)(a²+a-1)-a²(a-1)=a³+a²-a-2a²-2a+2-a³-a²=-3a+2
б)(3-p)(9+3p+p²)-(1-p³)=27+9p+3p²-9p-3p²-p³-1+p³=27-1=26