Ответ:

Делим числитель и знаменатель каждой дроби на их наибольший общий делитель.

  1. НОД(42, 24) = 6: \(\frac{42}{24}=\frac{7}{4}\); НОД(35, 77) = 7: \(\frac{35}{77}=\frac{5}{11}\); НОД(48, 60) = 12: \(\frac{48}{60}=\frac{4}{5}\); НОД(72, 96) = 24: \(\frac{72}{96}=\frac{3}{4}\).

  2. НОД(10, 100) = 10: \(\frac{10}{100}=\frac{1}{10}\); НОД(400, 1000) = 200: \(\frac{400}{1000}=\frac{2}{5}\); НОД(600, 800) = 200: \(\frac{600}{800}=\frac{3}{4}\); НОД(800, 1000) = 200: \(\frac{800}{1000}=\frac{4}{5}\).

  3. НОД(72, 90) = 18: \(\frac{72}{90}=\frac{4}{5}\); НОД(60, 105) = 15: \(\frac{60}{105}=\frac{4}{7}\); НОД(45, 150) = 15: \(\frac{45}{150}=\frac{3}{10}\); НОД(84, 120) = 12: \(\frac{84}{120}=\frac{7}{10}\).

  4. НОД(56, 70) = 14: \(\frac{56}{70}=\frac{4}{5}\); НОД(36, 90) = 18: \(\frac{36}{90}=\frac{2}{5}\); НОД(66, 110) = 22: \(\frac{66}{110}=\frac{3}{5}\); НОД(96, 160) = 32: \(\frac{96}{160}=\frac{3}{5}\).