Решим данные примеры:
- а) \(\frac{5}{11}-\frac{3}{11}+\frac{7}{11} = \frac{5-3+7}{11} = \frac{9}{11}\)
- б) \(9\frac{13}{19}+(8\frac{18}{19}-3\frac{15}{19}) = 9\frac{13}{19}+5\frac{3}{19} = 14\frac{16}{19}\)
- в) \(10\frac{4}{21}-(4\frac{10}{21}+3\frac{19}{21}) = 10\frac{4}{21}-7\frac{29}{21} = 10\frac{4}{21}-8\frac{8}{21} = 9\frac{25}{21}-8\frac{8}{21} = 1\frac{17}{21}\)
Ответ: а) \(\frac{9}{11}\); б) \(14\frac{16}{19}\); в) \(1\frac{17}{21}\)