62. Выполните вычитание: а) \(\frac{5}{9}-\frac{7}{18}\); б) \(\frac{4}{5}-\frac{5}{8}\); в) \(\frac{11}{16}-\frac{5}{12}\); г) \(\frac{8}{21}-\frac{4}{35}\).

1. \(\frac{5}{9}-\frac{7}{18}=\frac{10}{18}-\frac{7}{18}=\frac{3}{18}=\frac{1}{6}\).
2. \(\frac{4}{5}-\frac{5}{8}=\frac{32}{40}-\frac{25}{40}=\frac{7}{40}\).
3. \(\frac{11}{16}-\frac{5}{12}=\frac{33}{48}-\frac{20}{48}=\frac{13}{48}\).
4. \(\frac{8}{21}-\frac{4}{35}=\frac{40}{105}-\frac{12}{105}=\frac{28}{105}=\frac{4}{15}\).

Ответ: а) \(\frac{1}{6}\); б) \(\frac{7}{40}\); в) \(\frac{13}{48}\); г) \(\frac{4}{15}\).