\[\boxed{\mathbf{Вариант\ 1.}}\]
\[\boxed{\mathbf{1.}}\]
\[1)\]
\[2)\ P = 2 \cdot (3 + 6) = 18\ см.\]
\[3)\ S = 3 \cdot 6 = 18\ см^{2}.\]
\[\boxed{\mathbf{2.}}\]
\[1)\ Увеличь\ в\ 6\ раз:\]
\[7 \cdot 6 = 42\]
\[5 \cdot 6 = 30\]
\[8 \cdot 6 = 48\]
\[6 \cdot 6 = 36\]
\[9 \cdot 6 = 54\]
\[2)\ Уменьши\ в\ 5\ раз:\]
\[40\ :5 = 8\]
\[25\ :5 = 5\]
\[15\ :5 = 3\]
\[30\ :5 = 6\]
\[45\ :5 = 9\]
\[\boxed{\mathbf{3.}}\]
\[48\ :6 \cdot 3 = 8 \cdot 3 = 24\]
\[3 \cdot 6\ :18 = 18\ :18 = 1\]
\[6 \cdot (11 - 7)\ :3 = 6 \cdot 4\ :3 =\]
\[= 24\ :3 = 8\]
\[\boxed{\mathbf{4.}}\]
\[14;28.\]