\[\boxed{\text{4.\ 332}}\]
\[\textbf{а)}\ 68\ :( - 17) = - 4\]
\[\textbf{б)} - 301\ :43 = - 7\]
\[\textbf{в)} - 189\ :( - 9) = 21\]
\[\textbf{г)}\ 21,6\ :( - 1,2) = 216\ :( - 12) =\]
\[= - 18\]
\[\textbf{д)} - 93,7\ :( - 0,1) = 937\]
\[\textbf{е)} - 57,38\ :( - 1,9) =\]
\[= 5738\ :190 = 30,2\]