Давай разберем по порядку каждое выражение и найдем его значение.
1) \(3\frac{6}{7} - 1\frac{2}{7} + 2\frac{3}{7} - 2\frac{3}{7} + 2\frac{3}{7} - 4\frac{7}{7} = 5\)
\(= (3 - 1 + 2 - 2 + 2 - 4) + (\frac{6}{7} - \frac{2}{7} + \frac{3}{7} - \frac{3}{7} + \frac{3}{7} - \frac{7}{7}) = \)
\(= (3 - 1 + 2 - 2 + 2 - 4) + (\frac{6 - 2 + 3 - 3 + 3 - 7}{7}) = 0 + (\frac{0}{7}) = 0\)
\(= -1 + \frac{2}{7} = -\frac{7}{7} + \frac{2}{7} = -\frac{5}{7}\)
2) \(1\frac{4}{19} + 5\frac{11}{19} - 4\frac{12}{19} = (1 + 5 - 4) + (\frac{4}{19} + \frac{11}{19} - \frac{12}{19}) = 2 + (\frac{4 + 11 - 12}{19}) = 2 + \frac{3}{19} = 2\frac{3}{19}\)
3) \(4\frac{8}{11} - 2\frac{5}{11} - 1\frac{1}{11} = (4 - 2 - 1) + (\frac{8}{11} - \frac{5}{11} - \frac{1}{11}) = 1 + (\frac{8 - 5 - 1}{11}) = 1 + \frac{2}{11} = 1\frac{2}{11}\)
4) \(2\frac{6}{7} + 5\frac{5}{7} - 4\frac{4}{7} = (2 + 5 - 4) + (\frac{6}{7} + \frac{5}{7} - \frac{4}{7}) = 3 + (\frac{6 + 5 - 4}{7}) = 3 + \frac{7}{7} = 3 + 1 = 4\)
5) \(8\frac{1}{9} + 3\frac{8}{9} - 9\frac{4}{9} = (8 + 3 - 9) + (\frac{1}{9} + \frac{8}{9} - \frac{4}{9}) = 2 + (\frac{1 + 8 - 4}{9}) = 2 + \frac{5}{9} = 2\frac{5}{9}\)
6) \(1\frac{14}{17} + 1\frac{12}{17} - 1\frac{10}{17} = (1 + 1 - 1) + (\frac{14}{17} + \frac{12}{17} - \frac{10}{17}) = 1 + (\frac{14 + 12 - 10}{17}) = 1 + \frac{16}{17} = 1\frac{16}{17}\)
7) \(7\frac{11}{21} + 5\frac{8}{21} + 2\frac{10}{21} = (7 + 5 + 2) + (\frac{11}{21} + \frac{8}{21} + \frac{10}{21}) = 14 + (\frac{11 + 8 + 10}{21}) = 14 + \frac{29}{21} = 14 + 1\frac{8}{21} = 15\frac{8}{21}\)
8) \(15\frac{3}{7} - 7\frac{4}{7} - 2\frac{6}{7} = (15 - 7 - 2) + (\frac{3}{7} - \frac{4}{7} - \frac{6}{7}) = 6 + (\frac{3 - 4 - 6}{7}) = 6 + (\frac{-7}{7}) = 6 - 1 = 5\)
9) \(12\frac{3}{11} - 5\frac{6}{11} + 1\frac{9}{11} = (12 - 5 + 1) + (\frac{3}{11} - \frac{6}{11} + \frac{9}{11}) = 8 + (\frac{3 - 6 + 9}{11}) = 8 + \frac{6}{11} = 8\frac{6}{11}\)
10) \(8\frac{2}{31} - 7\frac{17}{31} + 2\frac{30}{31} = (8 - 7 + 2) + (\frac{2}{31} - \frac{17}{31} + \frac{30}{31}) = 3 + (\frac{2 - 17 + 30}{31}) = 3 + \frac{15}{31} = 3\frac{15}{31}\)
Ответ: См. решения выше