Решение примеров

1. $$1\frac{9}{11} + 2\frac{3}{11} = (1+2) + (\frac{9}{11} + \frac{3}{11}) = 3 + \frac{12}{11} = 3 + 1\frac{1}{11} = 4\frac{1}{11}$$
2. $$3\frac{2}{9} + 1\frac{7}{9} = (3+1) + (\frac{2}{9} + \frac{7}{9}) = 4 + \frac{9}{9} = 4 + 1 = 5$$
3. $$4\frac{1}{3} - 2\frac{2}{3} = \frac{13}{3} - \frac{8}{3} = \frac{5}{3} = 1\frac{2}{3}$$
4. $$26\frac{2}{5} - 17\frac{3}{5} = 25\frac{7}{5} - 17\frac{3}{5} = (25-17) + (\frac{7}{5} - \frac{3}{5}) = 8 + \frac{4}{5} = 8\frac{4}{5}$$
5. $$8\frac{2}{7} - 3\frac{4}{7} = 7\frac{9}{7} - 3\frac{4}{7} = (7-3) + (\frac{9}{7} - \frac{4}{7}) = 4 + \frac{5}{7} = 4\frac{5}{7}$$