\[\boxed{\mathbf{1.}}\]
\[\textbf{а)}\]
\[\textbf{б)}\ \]
\[\boxed{\mathbf{2.}}\]
\[E \cap F = \left\{ 6;8 \right\};\]
\[E \cup F = \left\{ 2;4;6;8;7 \right\}.\]
\[\boxed{\mathbf{3.}}\]
\[\textbf{а)}\ 1)\ 48\ :6 = 8\ (л) - молока\ в\ \]
\[одном\ бидоне.\]
\[2)\ 8 \cdot 4 = 32\ (л) - молока\ в\ \]
\[4\ бидонах.\ \]
\[Ответ:32\ л.\]
\[\textbf{б)}\ 1)\ 15\ :5 = 3\ (мотка) -\]
\[шерсти\ надо\ на\ одну\ шапку.\]
\[2)\ 36\ :3 = 12\ (шапок) - можно\ \]
\[связать\ из\ 36\ мотков.\]
\[Ответ:12\ шапок.\]
\[\boxed{\mathbf{4.}}\]
\[7 \cdot 80 = 560\]
\[19 \cdot 6 = 114\]
\[350 \cdot 2 = 700\]
\[69\ :3 = 23\]
\[80\ :5 = 16\]
\[270\ :9 = 30\]
\[72\ :12 = 6\]
\[540\ :60 = 9\]
\[960\ :8 = 120\]
\[\boxed{\mathbf{5.}}\]
\[\textbf{а)}\ 59\ :8 = 7\ (ост.\ 3)\]
\[Проверка:\]
\[7 \cdot 8 + 3 = 56 + 3 = 59.\]
\[\textbf{б)}\ 40\ :14 = 2\ (ост.\ 12)\]
\[Проверка:\]
\[2 \cdot 14 + 12 = 28 + 12 = 40.\]
\[\boxed{\mathbf{6.}}\]
\[= 12\ :3 - 0 \cdot 45 + 6\ :1 =\]
\[= 4 + 6 = 10\]
\[\boxed{\mathbf{7.}}\]
\[\boxed{\mathbf{8.}}\]
\[\textbf{а)}\]
\[\textbf{б)}\ \]