\[\boxed{\mathbf{820\ (820)}\mathbf{.}\mathbf{\ }Еуроки\ - \ ДЗ\ без\ мороки}\]
\[K = \left\{ а;з;и;м \right\}\]
\[L = \left\{ з;и;й;м;о;ы\ \right\}\]
\[M = \left\{ в;е;з;и;м;о;ь \right\}\]
\[\textbf{а)}\ K \cap L \cap M = \left\{ з;и;м \right\}.\]
\[\textbf{б)}\ K \cup L \cup M = \left\{ а;в;е;з;и;й;м;о;ь;ы \right\}.\]