1. Выполни действия: 10 4 3 a) 11 11 + 11; B) 6-2: 8 5 8 6) 49+39; г) 5 13 - 1 13

а) \[\frac{10}{11} - \frac{4}{11} + \frac{3}{11} = \frac{10-4+3}{11} = \frac{9}{11}\]

б) \[ 6 - 2\frac{3}{8} = 5\frac{8}{8} - 2\frac{3}{8} = (5-2) + (\frac{8}{8} - \frac{3}{8}) = 3\frac{5}{8} \]

в) \[ 4\frac{5}{9} + 3\frac{8}{9} = (4+3) + (\frac{5}{9} + \frac{8}{9}) = 7 + \frac{13}{9} = 7 + 1\frac{4}{9} = 8\frac{4}{9} \]

г) \[ 5\frac{6}{13} - 1\frac{11}{13} = 4\frac{19}{13} - 1\frac{11}{13} = (4-1) + (\frac{19}{13} - \frac{11}{13}) = 3 + \frac{8}{13} = 3\frac{8}{13} \]