\[\boxed{\mathbf{888\ (}\mathbf{н}\mathbf{)}\mathbf{.}\mathbf{\ }Еуроки\ - \ ДЗ\ без\ мороки}\]
\[A = \left\{ 3;9;\ - 8 \right\}\]
\[A_{1} = \left\{ 3;9 \right\};\ \ \ A_{2} = \left\{ 3; - 8 \right\};\ \ \]
\[A_{3} = \{ 9; - 8\}\]