Образец: 7 4/5 - 1 1/5 = (7 - 1) + (4/5 - 1/5) = 6 + 3/5 = 6 3/5

Решение примеров: Столбец 1: 1) $2\frac{7}{9} - \frac{5}{9} = 2 + (\frac{7}{9} - \frac{5}{9}) = 2\frac{2}{9}$ 2) $9\frac{4}{7} - 5 = (9 - 5) + \frac{4}{7} = 4\frac{4}{7}$ 3) $7\frac{4}{9} - \frac{4}{9} = 7 + (\frac{4}{9} - \frac{4}{9}) = 7$ 4) $4\frac{1}{5} + \frac{3}{5} = 4 + (\frac{1}{5} + \frac{3}{5}) = 4\frac{4}{5}$ Столбец 2: 1) $7\frac{7}{12} - 2 = (7 - 2) + \frac{7}{12} = 5\frac{7}{12}$ 2) $4\frac{5}{7} - \frac{3}{7} = 4 + (\frac{5}{7} - \frac{3}{7}) = 4\frac{2}{7}$ 3) $5\frac{1}{2} + 8 = (5 + 8) + \frac{1}{2} = 13\frac{1}{2}$ 4) $6\frac{1}{3} - 4 = (6 - 4) + \frac{1}{3} = 2\frac{1}{3}$ Столбец 3: 1) $5\frac{1}{8} + 3\frac{3}{8} = (5 + 3) + (\frac{1}{8} + \frac{3}{8}) = 8\frac{4}{8} = 8\frac{1}{2}$ 2) $4\frac{7}{9} - 3\frac{2}{9} = (4 - 3) + (\frac{7}{9} - \frac{2}{9}) = 1\frac{5}{9}$ 3) $5\frac{3}{7} + 2\frac{1}{7} = (5 + 2) + (\frac{3}{7} + \frac{1}{7}) = 7\frac{4}{7}$ 4) $5\frac{3}{7} - 2\frac{1}{7} = (5 - 2) + (\frac{3}{7} - \frac{1}{7}) = 3\frac{2}{7}$