4. \(8\frac{5}{12}-3\frac{11}{12}\)

\[8\frac{5}{12}-3\frac{11}{12}=7\frac{17}{12}-3\frac{11}{12}=4\frac{6}{12}=4\frac{1}{2}.\]

Ответ: \(4\frac{1}{2}\).