Решение:
- а) \( \frac{5}{7} - \frac{2}{7} = \frac{5-2}{7} = \frac{3}{7} \)
- б) \( \frac{9}{36} - \frac{7}{36} = \frac{9-7}{36} = \frac{2}{36} \)
- в) \( \frac{8}{12} - \frac{3}{12} = \frac{8-3}{12} = \frac{5}{12} \)
- г) \( \frac{258}{100} - \frac{16}{100} = \frac{258-16}{100} = \frac{242}{100} = 2\frac{42}{100} = 242\% \)
Ответ: а) 3/7, б) 2/36, в) 5/12, г) 242/100