2. Вычисли: 1) 5/7 + 1/7 2) 5/7 - 1/7 3) 4 2/9 + 3 4) 5 3/6 - 2 1/6 5) 6 7/10 - 4 3/10 6) 5:9 7) 9:5 8) 5/12 + 11/12 9) 7 2/11 - 2 5/11

2. Вычисли: 1) \(\frac{5}{7} + \frac{1}{7} = \frac{5+1}{7} = \frac{6}{7}\) 2) \(\frac{5}{7} - \frac{1}{7} = \frac{5-1}{7} = \frac{4}{7}\) 3) \(4 \frac{2}{9} + 3 = 4 + \frac{2}{9} + 3 = 7 \frac{2}{9}\) 4) \(5 \frac{3}{6} - 2 \frac{1}{6} = (5-2) + (\frac{3}{6} - \frac{1}{6}) = 3 + \frac{2}{6} = 3 \frac{1}{3}\) 5) \(6 \frac{7}{10} - 4 \frac{3}{10} = (6-4) + (\frac{7}{10} - \frac{3}{10}) = 2 + \frac{4}{10} = 2 \frac{2}{5}\) 6) \(5 : 9 = \frac{5}{9}\) 7) \(9 : 5 = \frac{9}{5} = 1 \frac{4}{5}\) 8) \(\frac{5}{12} + \frac{11}{12} = \frac{5+11}{12} = \frac{16}{12} = \frac{4}{3} = 1 \frac{1}{3}\) 9) \(7 \frac{2}{11} - 2 \frac{5}{11} = (7-2) + (\frac{2}{11} - \frac{5}{11}) = 5 - \frac{3}{11} = 4 \frac{8}{11}\)