4. Сократить дробь:

Решение:

1. \( \frac{10}{25} = \frac{10 \div 5}{25 \div 5} = \frac{2}{5} \)
2. \( \frac{14}{35} = \frac{14 \div 7}{35 \div 7} = \frac{2}{5} \)
3. \( \frac{75}{100} = \frac{75 \div 25}{100 \div 25} = \frac{3}{4} \)
4. \( 3 \frac{4}{28} = 3 \frac{4 \div 4}{28 \div 4} = 3 \frac{1}{7} \)
5. \( \frac{15}{60} = \frac{15 \div 15}{60 \div 15} = \frac{1}{4} \)
6. \( 15 \frac{35}{84} = 15 \frac{35 \div 7}{84 \div 7} = 15 \frac{5}{12} \)

Ответ: 4-а) \( \frac{2}{5} \), 4-б) \( \frac{2}{5} \), 4-в) \( \frac{3}{4} \), 4-г) \( 3 \frac{1}{7} \), 4-д) \( \frac{1}{4} \), 4-е) \( 15 \frac{5}{12} \).