\[\boxed{\mathbf{811\ (811)}\mathbf{.}\mathbf{\ }Еуроки\ - \ ДЗ\ без\ мороки}\]
\(а)\ \)\(\ \)
\[A \supset B \supset C\]
\[C \subset B \subset A\]
\(б)\ \)\(\ \)
\[R \supset P \supset K\]
\[K \subset P \subset R.\]