4. 3,6 : (3,2 − 1,3) + 8

\(3{,}2-1{,}3=1{,}9\).

\(3{,}6:1{,}9=\frac{36}{19}\).

\(\frac{36}{19}+8=\frac{36+152}{19}=\frac{188}{19}=9\frac{17}{19}\).

Ответ: \(9\frac{17}{19}\).