Задание 1. Вычислите: а) 3 3/15 + 1 2/5; б) 7 5/9 − 4 7/18; в) 4 2/6 + 2 5/7; г) 9 − 3 4/5.

а) \(3\frac{3}{15}+1\frac{2}{5}=3\frac{1}{5}+1\frac{2}{5}=4\frac{3}{5}\).

б) \(7\frac{5}{9}-4\frac{7}{18}=7\frac{10}{18}-4\frac{7}{18}=3\frac{3}{18}=3\frac{1}{6}\).

в) \(4\frac{2}{6}+2\frac{5}{7}=4\frac{1}{3}+2\frac{5}{7}=6+\frac{7}{21}+\frac{15}{21}=6\frac{22}{21}=7\frac{1}{21}\).

г) \(9-3\frac{4}{5}=5\frac{1}{5}\).

Ответ: а) \(4\frac{3}{5}\); б) \(3\frac{1}{6}\); в) \(7\frac{1}{21}\); г) \(5\frac{1}{5}\).