\[\boxed{\text{682\ (682).\ }\text{Еуроки\ -\ ДЗ\ без\ мороки}}\]
\[1)\ (1 - b^{2})\left( 1 + b^{2} + b^{4} \right) =\]
\[= 1 - b^{6}\]
\[при\ b = - 2:\ \ \]
\[1 - ( - 2)^{6} = 1 - 64 = - 63\]
\[2)\ 2x³ + 7 - (x + 1)\left( x^{2} - x + 1 \right) =\]
\[= 2x^{3} + 7 - x^{3} - 1 = x^{3} + 6\]
\[при\ x = - 1:\ \ \]
\[- 1 + 6 = 5\]