\[\boxed{\mathbf{4.132}}\]
\[\textbf{а)}\ 5418\ :18 =\]
\[= (5400 + 18)\ :18 =\]
\[= 5400\ :18 + 18\ :18 =\]
\[= 300 + 1 = 301\]
\[\textbf{б)}\ 3939\ :13 =\]
\[= (3900 + 39)\ :13 =\]
\[= 3900\ :13 + 39\ :13 =\]
\[= 300 + 3 = 303\]
\[\textbf{в)}\ 6075\ :15 =\]
\[= (6000 + 75)\ :15 =\]
\[= 6000\ :15 + 75\ :15 =\]
\[= 400 + 5 = 405\]
\[\textbf{г)}\ 3248\ :16 =\]
\[= (3200 + 48)\ :16 =\]
\[= 3200\ :16 + 48\ :16 =\]
\[= 200 + 3 = 203\]
\[\textbf{д)}\ 2392\ :8 = (2400 - 8)\ :8 =\]
\[= 2400\ :8 - 8\ :8 = 300 - 1 =\]
\[= 299\ \]