8) 3 1/4 − 1/18

\(3\frac{1}{4}=\frac{13}{4}=\frac{117}{36}\), \(\frac{1}{18}=\frac{2}{36}\).

\(\frac{117}{36}-\frac{2}{36}=\frac{115}{36}=3\frac{7}{36}\).

Ответ: \(3\frac{7}{36}\).