\(\boxed{\mathbf{4.}}\)
\[1)\ 8:\ \ \ \ \ 8,\ 16,\ 24,\ 32\]
\[2)\ 15:\ \ \ 15,\ 30,\ 45,\ 60\]
\[3)\ 12:\ \ \ 12,\ 24,\ 36,\ 48\]
\[4)\ 14:\ \ \ 14,\ 28,\ 42,\ 56\]
\[\boxed{\mathbf{5.}}\]
\[1)\ 7\ и\ 3:\]
\[21,\ 42.\]
\[2)\ 2\ и\ 6:\]
\[6,\ 12.\]
\[3)\ 8\ и\ 12:\]
\[24,\ 48.\]
\[\boxed{\mathbf{6.}}\]
\[1)\ НОК(a,\ b) = a \cdot 3 =\]
\[= 2 \cdot 3 \cdot 5 \cdot 3 = 60.\]
\[2)\ НОК(a,\ b) = b \cdot 3 =\]
\[= 3 \cdot 3 \cdot 7 \cdot 7 = 441.\]
\[3)\ НОК(a,\ b) = a \cdot 3 \cdot 11 =\]
\[= 2 \cdot 2 \cdot 3 \cdot 5 \cdot 33 = 1980.\]
\[4)\ НОК(a,\ b) = a \cdot 23 =\]
\[= 2 \cdot 3 \cdot 19 \cdot 23 = 2622.\]