(a-6)(a+5)(a-1)-(aa-2a)(a+1) Упростите выражение, пожалуйста)))
(a - 6)(a + 5)(a - 1) - (a^2 - 2a)(a + 1) = = (a^2 + 5a - 6a - 30)(a - 1) - (a^3 + a^2 - 2a^2 - 2a) = = (a^2 - a - 30)(a - 1) - (a^3 - a^2 - 2a) = = a^2 (a - 1) - a (a - 1) - 30(a - 1) - a^3 + a^2 + 2a = = a^3 - a^2 - a^2 + a - 30a + 30 - a^3 + a^2 + 2a = = - a^2 - 27a + 30 = - (a^2 + 27a - 30)