A 12 5 4 + 91 13 13 13 7 815+1 614-35 た 11

а) \(\frac{12}{13} + \frac{5}{13} + \frac{4}{13} = \frac{12 + 5 + 4}{13} = \frac{21}{13} = 1\frac{8}{13}\)

б) \(5\frac{7}{11} + 1\frac{9}{11} = (5 + 1) + (\frac{7}{11} + \frac{9}{11}) = 6 + \frac{16}{11} = 6 + 1\frac{5}{11} = 7\frac{5}{11}\)

в) \(4 - 3\frac{5}{11} = 3\frac{11}{11} - 3\frac{5}{11} = (3 - 3) + (\frac{11}{11} - \frac{5}{11}) = 0 + \frac{6}{11} = \frac{6}{11}\)

г) \(6\frac{5}{11} - 4\frac{9}{11} = 5\frac{16}{11} - 4\frac{9}{11} = (5 - 4) + (\frac{16}{11} - \frac{9}{11}) = 1 + \frac{7}{11} = 1\frac{7}{11}\)