Ответ:

  1. \(\frac{48}{64}=\frac{3}{4}\).
  2. \(\frac{85}{119}=\frac{5}{7}\).
  3. \(\frac{125}{200}=\frac{5}{8}\).
  4. \(\frac{72}{96}=\frac{3}{4}\).
  5. \(\frac{55}{121}=\frac{5}{11}\).
  6. \(\frac{63}{105}=\frac{3}{5}\).
  7. \(\frac{84}{112}=\frac{3}{4}\).
  8. \(\frac{91}{143}=\frac{7}{11}\).
  9. \(\frac{104}{156}=\frac{2}{3}\).
  10. \(\frac{115}{161}=\frac{5}{7}\).
  11. \(\frac{126}{189}=\frac{2}{3}\).
  12. \(\frac{140}{196}=\frac{5}{7}\).

Ответ: 1) \(\frac34\); 2) \(\frac57\); 3) \(\frac58\); 4) \(\frac34\); 5) \(\frac5{11}\); 6) \(\frac35\); 7) \(\frac34\); 8) \(\frac7{11}\); 9) \(\frac23\); 10) \(\frac57\); 11) \(\frac23\); 12) \(\frac57\).