\[\boxed{\text{4.\ 306}}\]
\[\textbf{а)} - 34\ :17 = - 2\]
\[\textbf{б)}\ 36\ :( - 12) = - 3\]
\[\textbf{в)}\ 630\ :( - 7) = - 90\]
\[\textbf{г)} - 25\ :( - 5) = 5\]
\[\textbf{д)} - 48\ :( - 16) = 3\]
\[\textbf{е)} - 76\ :( - 19) = 4\]