\[\boxed{\mathbf{220}.}\]
\[1)\ \left( x^{2} - 16 \right)\left( 25 - x^{2} \right) = 0\]
\[x^{2} - 16 = 0;\ \ \ 25 - x^{2} = 0\]
\[x^{2} = 16\ \ \ \ \ \ \ \ \ \ \ \ \ x^{2} = 25\]
\[x = \pm 4\ \ \ \ \ \ \ \ \ \ \ \ \ \ x = \pm 5.\]
\[Ответ:x = \left\{ - 5; - 4;4;5 \right\}.\]
\[2)\ \left( x^{3} - 1 \right)\left( x^{2} + x + 3 \right) = 0\]
\[x^{2} - 1 = 0\]
\[x^{3} = 1\]
\[x = 1.\]
\[x^{2} + x + 3 = 0\]
\[D = 1 - 12 =\]
\[= - 11 < 0\ (нет\ корней).\]
\[Ответ:x = \left\{ 1 \right\}.\]