(a-1)^3-4a(a+1)(a-1)+3 (a-1)(a^2+a+1)при a=-2

(a-1)^3-4a(a+1)(a-1)+3 (a-1)(a^2+a+1)=(a-1)((a-1)^2-4a(a^2+a+1))=(a-1)(a^2-2a+1-4a^3-4a^2-4a^2-4a)=(a-1)(1-4a^3-3a^2-6a)

A=-2 (-2-1)(1-4(-2)^3-3(-2)^2-6(-2))=-3(1+32-12+12)=-3*33=-99

(-2-1)^3-4*(-2)*(-2+1)(-2-1)+3*(-2-1)((-2)^2-2+1)=(-3)^3+8(-1)(-3)+3(-3)(4-2+1)=-27-8(-3)-9(3)=-27+24-27=--3-27=-30