3) 6 1/15 − 5 5/6 + 1 7/12 · 5 1/19

Сначала умножаем: \(1\frac{7}{12}\cdot5\frac{1}{19}=\frac{19}{12}\cdot\frac{96}{19}=8\).

\(6\frac{1}{15}-5\frac{5}{6}+8=\frac{91}{15}-\frac{35}{6}+8=\frac{182-175+240}{30}=\frac{247}{30}=8\frac{7}{30}.\)

Ответ: \(8\frac{7}{30}\).