Question

упростите выражения (a-1)(a²+a+1)-a²(a-8)​

Answer 1

1) ${a}^{3} - 1 - {a}^{2} (a - 8) = {a}^{3} - 1 - {a}^{3} + 8 {a}^{2} = - 1 + 8 {a}^{2}$

2) ${b}^{3} + 8 - b( {b}^{2} - 1) = {b}^{3} + 8 - {b}^{3} + b = 8 + b$

3) $2 {a}^{3} + 7( {x}^{3} + 1) = 2 {a}^{3} + 7 {x}^{3} + 7$

4) ${y}^{3} - ( {y}^{3} - 27) = {y}^{3} - {y}^{3} + 27 = 27$