Ответ:

  1. \(\frac{2}{8}=\frac{1}{4}\);
  2. \(\frac{15}{20}=\frac{3}{4}\);
  3. \(\frac{18}{30}=\frac{3}{5}\);
  4. \(\frac{24}{36}=\frac{2}{3}\);
  5. \(\frac{9}{45}=\frac{1}{5}\);
  6. \(\frac{64}{48}=\frac{4}{3}\).