Ответ:

  1. а) \(\frac{1}{2}-\frac{1}{4}=\frac{2}{4}-\frac{1}{4}=\frac{1}{4}\).
  2. б) \(\frac{5}{9}-\frac{1}{3}=\frac{5}{9}-\frac{3}{9}=\frac{2}{9}\).
  3. в) \(\frac{7}{10}-\frac{3}{5}=\frac{7}{10}-\frac{6}{10}=\frac{1}{10}\).
  4. г) \(\frac{16}{27}-\frac{1}{9}=\frac{16}{27}-\frac{3}{27}=\frac{13}{27}\).
  5. д) \(\frac{3}{5}-\frac{13}{45}=\frac{27}{45}-\frac{13}{45}=\frac{14}{45}\).
  6. е) \(\frac{1}{3}-\frac{8}{27}=\frac{9}{27}-\frac{8}{27}=\frac{1}{27}\).
  7. ж) \(\frac{1}{2}-\frac{1}{3}=\frac{3-2}{6}=\frac{1}{6}\).
  8. з) \(\frac{3}{5}-\frac{1}{3}=\frac{9-5}{15}=\frac{4}{15}\).
  9. и) \(\frac{7}{8}-\frac{2}{3}=\frac{21-16}{24}=\frac{5}{24}\).
  10. к) \(\frac{3}{4}-\frac{4}{7}=\frac{21-16}{28}=\frac{5}{28}\).
  11. л) \(\frac{9}{16}-\frac{11}{24}=\frac{27-22}{48}=\frac{5}{48}\).
  12. м) \(\frac{11}{12}-\frac{11}{18}=\frac{33-22}{36}=\frac{11}{36}\).

Ответ: а) \(\frac{1}{4}\); б) \(\frac{2}{9}\); в) \(\frac{1}{10}\); г) \(\frac{13}{27}\); д) \(\frac{14}{45}\); е) \(\frac{1}{27}\); ж) \(\frac{1}{6}\); з) \(\frac{4}{15}\); и) \(\frac{5}{24}\); к) \(\frac{5}{28}\); л) \(\frac{5}{48}\); м) \(\frac{11}{36}\).