1. Найдите значение выражения: A) \(\frac{5}{11} - \frac{3}{11} + \frac{7}{11} =\) Б) \(9\frac{13}{19} + (8\frac{18}{19} - 3\frac{15}{19}) =\) В) \(10\frac{4}{21} - (4\frac{4}{21} + 3\frac{19}{21}) =\)

Решение:

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) \(10\frac{4}{21} - (4\frac{4}{21} + 3\frac{19}{21}) = 10\frac{4}{21} - 7\frac{23}{21} = 10\frac{4}{21} - 8\frac{2}{21} = 2\frac{2}{21}\)

Ответ: А) \(\frac{9}{11}\); Б) \(14\frac{16}{19}\); В) \(2\frac{2}{21}\)