\[\boxed{\mathbf{Страница\ 13.\ }\mathbf{Еуроки\ - \ ДЗ\ без\ мороки}}\]
\[\boxed{\mathbf{1.\ }}\]
\[3 \in A;\ \ \notin A;\ \ m \in A;\ \]
\[\ \in A;\ \ 5 \notin A;\ \ \ \in A.\]
\[\boxed{\mathbf{2.\ }}\]
\[\boxed{\mathbf{3.\ }}\]
\[\boxed{\mathbf{4.\ }}\]
\[\boxed{\mathbf{5.\ }}\]
\[\textbf{а)}\ 18\ :5 = 3\ (ост.\ 3)\]
\[3 \cdot 5 + 3 = 15 + 3 = 18\]
\[\textbf{б)}\ 19\ :4 = 4\ (ост.\ 3)\]
\[4 \cdot 4 + 3 = 16 + 3 = 19\]
\[\boxed{\mathbf{6.\ }}\]
\[45\ :7 = 6\ (ост.\ 3)\]
\[6 \cdot 7 + 3 = 42 + 3 = 45\]
\[67\ :9 = 7\ (ост.\ 4)\]
\[7 \cdot 9 + 4 = 63 + 4 = 67\]
\[\mathbf{Урок\ 6.\ Решение\ задач}\]