\[\boxed{\mathbf{Страница\ 28.\ }\mathbf{Еуроки\ - \ ДЗ\ без\ мороки}}\]
\[\boxed{\mathbf{1.\ }}\]
\(\mathbf{а)\ }\)
\(\mathbf{б)\ }\)
\[\boxed{\mathbf{2.\ }}\]
\[\mathbf{а)}\]
\(\mathbf{\ }\)
\[m \in A;\ \ m \notin B;\ \ \in A;\ \ \]
\[\in B;\ \ 7 \in A;\ \ 7 \in B;\]
\[\ \notin A;\ \ \in B;\ \ \ \ \ b \notin A;\ \ \ \]
\[\ b \in B\ \]
\[\textbf{б)}\ A \cup B = \left\{ m;7;b;\ ;\ \right\}.\]
\[\textbf{в)}\ \ A \cup B =\]
\[\boxed{\mathbf{3.\ }}\]
\[C \cup D = \left\{ 4;5;d;\ \boxdot ;\ \odot \right\}.\]
\[\boxed{\mathbf{4.\ }}\]
\[\mathbf{Урок\ 15.\ Решение\ задач}\]