\[\boxed{\mathbf{Вариант\ 2.}}\]
\[\boxed{\mathbf{1.}}\]
\[3 \cdot 4 < 3 + 3 + 4 + 3\]
\[7 + 7 + 7 + 7 = 7 \cdot 4\]
\[1 \cdot 36 > 36 - 1\]
\[6 \cdot 5 > 6 + 5\]
\[10 \cdot 8 > 18\]
\[0 \cdot 100 < 99 + 1\]
\[\boxed{\mathbf{2.}}\]
\[2 \cdot 8 = 16\]
\[5 \cdot 2 = 10\]
\[12\ :2 = 6\]
\[18\ :9 = 2\]
\[92 - 70 + 17 = 22 + 17 = 39\]
\[83 - (37 + 6) = 83 - 43 = 40\]
\[\boxed{\mathbf{3.}}\]
\[8\ :2 = 4\ (мелка) - в\ одной\ \]
\[коробке.\]
\[Ответ:4\ мелка.\]
\[\boxed{\mathbf{4.}}\]
\[1)\]
\[2)\ OK = 9\ см - 4\ см = 5\ см.\]
\[\boxed{\mathbf{5.}}\]
\[63 - 20 + 7 = 50\]
\[25 + 15 - 10 = 30\]