2 Вычислите: a) 3 3/4 + 6/7; б) 3 5/5 - 2 2/5; в) 1 2/3 * 3/10; г) 3 1/8 : 2 1/4

а) \(3\frac{3}{4} + \frac{6}{7} = \frac{15}{4} + \frac{6}{7} = \frac{105 + 24}{28} = \frac{129}{28} = 4\frac{17}{28}\) б) \(3\frac{5}{5} - 2\frac{2}{5} = 4 - \frac{12}{5} = \frac{20 - 12}{5} = \frac{8}{5} = 1\frac{3}{5}\) в) \(1\frac{2}{3} \cdot \frac{3}{10} = \frac{5}{3} \cdot \frac{3}{10} = \frac{15}{30} = \frac{1}{2}\) г) \(3\frac{1}{8} : 2\frac{1}{4} = \frac{25}{8} : \frac{9}{4} = \frac{25}{8} \cdot \frac{4}{9} = \frac{100}{72} = \frac{25}{18} = 1\frac{7}{18}\)