\[\boxed{\text{511\ (511).\ }\text{Еуроки\ -\ ДЗ\ без\ мороки}}\]
Пояснение.
Решение.
\[1)\ 5b(b - 1)(b + 1) =\]
\[= 5b\left( b^{2} - 1 \right) = 5b^{3} - 5b\]
\[2)\ (c + 2)(c - 2) \cdot 8c^{2} =\]
\[= \left( c^{2} - 4 \right) \cdot 8c^{2} = 8c^{4} - 36c^{2}\]
\[3)\ (m - 10)\left( m^{2} + 100 \right)(m + 10) =\]
\[= \left( m^{2} - 100 \right)\left( m^{2} + 100 \right) =\]
\[= m^{4} - 10000\]
\[4)\ \left( a^{2} + 1 \right)\left( a^{2} - 1 \right)\left( a^{4} + 1 \right) =\]
\[= \left( a^{4} - 1 \right)\left( a^{4} + 1 \right) = a^{8} - 1\]