Задание №4. Размести дроби в порядке возрастания: 67/68, 9/13, 3/7, 8/9, 6/13, 7/22, 8/15, 7/19, 5/21.

Сравним значения дробей:

1. \(\frac{5}{21}\approx0.238\);
2. \(\frac{7}{22}\approx0.318\);
3. \(\frac{7}{19}\approx0.368\);
4. \(\frac{3}{7}\approx0.429\);
5. \(\frac{6}{13}\approx0.462\);
6. \(\frac{8}{15}\approx0.533\);
7. \(\frac{9}{13}\approx0.692\);
8. \(\frac{8}{9}\approx0.889\);
9. \(\frac{67}{68}\approx0.985\).

Ответ: \(\frac{5}{21} < \frac{7}{22} < \frac{7}{19} < \frac{3}{7} < \frac{6}{13} < \frac{8}{15} < \frac{9}{13} < \frac{8}{9} < \frac{67}{68}\).