5.504 Выполните действия: a) 1/4 + 1/7 б) 1/2 - 3/8 в) 4 + 4/7 г) 3/4 + 5/6

a) \(\frac{1}{4} + \frac{1}{7} = \frac{7}{28} + \frac{4}{28} = \frac{11}{28}\) б) \(\frac{1}{2} - \frac{3}{8} = \frac{4}{8} - \frac{3}{8} = \frac{1}{8}\) в) \(4 + \frac{4}{7} = \frac{28}{7} + \frac{4}{7} = \frac{32}{7} = 4\frac{4}{7}\) г) \(\frac{3}{4} + \frac{5}{6} = \frac{9}{12} + \frac{10}{12} = \frac{19}{12} = 1\frac{7}{12}\)