Ответ:

  1. \(\frac{2}{4}=\frac{1}{2}\);
  2. \(\frac{7}{28}=\frac{1}{4}\);
  3. \(\frac{6}{20}=\frac{3}{10}\);
  4. \(\frac{24}{56}=\frac{3}{7}\);
  5. \(\frac{42}{98}=\frac{3}{7}\);
  6. \(\frac{18}{81}=\frac{2}{9}\);
  7. \(\frac{60}{156}=\frac{5}{13}\);
  8. \(\frac{150}{400}=\frac{3}{8}\);
  9. \(\frac{360}{504}=\frac{5}{7}\).