Решение:

а) $$5\frac{1}{6} + 3\frac{1}{18} = 5\frac{3}{18} + 3\frac{1}{18} = 8\frac{4}{18} = 8\frac{2}{9}$$

б) $$5\frac{1}{8} + 3\frac{2}{5} = 5\frac{5}{40} + 3\frac{16}{40} = 8\frac{21}{40}$$

в) $$3\frac{2}{25} + 4\frac{14}{15} = 3\frac{6}{75} + 4\frac{70}{75} = 7\frac{76}{75} = 8\frac{1}{75}$$

г) $$7\frac{11}{15} - 3\frac{3}{20} = 7\frac{44}{60} - 3\frac{9}{60} = 4\frac{35}{60} = 4\frac{7}{12}$$

д) $$3\frac{5}{6} - 1\frac{4}{5} = 3\frac{25}{30} - 1\frac{24}{30} = 2\frac{1}{30}$$

e) $$6\frac{1}{2} - 2\frac{4}{5} = 6\frac{5}{10} - 2\frac{8}{10} = 5\frac{15}{10} - 2\frac{8}{10} = 3\frac{7}{10}$$