2 1. Выполни действия: a) 3\frac{6}{9} + 1\frac{7}{9} = b) 5\frac{4}{13} - 3\frac{12}{13} = д) 2\frac{3}{5} + \frac{2}{8} + 1\frac{6}{8} + 4\frac{2}{5} = e) (6\frac{4}{10} + 2\frac{5}{7}) - 5\frac{4}{10} =

a) 3\frac{6}{9} + 1\frac{7}{9} = 4 + \frac{6}{9} + \frac{7}{9} = 4 + \frac{13}{9} = 4 + 1\frac{4}{9} = 5\frac{4}{9}

б) 5\frac{4}{13} - 3\frac{12}{13} = 4\frac{17}{13} - 3\frac{12}{13} = 1\frac{5}{13}

д) 2\frac{3}{5} + \frac{2}{8} + 1\frac{6}{8} + 4\frac{2}{5} = 2\frac{3}{5} + 4\frac{2}{5} + \frac{2}{8} + 1\frac{6}{8} = 6 + 1 + \frac{8}{8} = 7 + 1 = 8

e) (6\frac{4}{10} + 2\frac{5}{7}) - 5\frac{4}{10} = (6\frac{14}{35} + 2\frac{25}{35}) - 5\frac{14}{35} = 8\frac{39}{35} - 5\frac{14}{35} = 8\frac{39}{35} - 5\frac{14}{35} = 3 + \frac{25}{35} = 3\frac{5}{7}

Ответ: a) 5\frac{4}{9}; б) 1\frac{5}{13}; д) 8; e) 3\frac{5}{7}