3) Выполни вычитание: a) 5/7 - 2/7 = 5-2/7 = 3/7 б) 8/12 - 3/12 = 8*3/12 = 5/72 в) 9/36 - 7/36 = 9-7/36 = 2/36 г) 258/100 - 16/100 = 258-16/100 = 242/100 = 2 42%

a) $$ \frac{5}{7} - \frac{2}{7} = \frac{5-2}{7} = \frac{3}{7} $$

б) $$ \frac{8}{12} - \frac{3}{12} = \frac{8-3}{12} = \frac{5}{12} $$

в) $$ \frac{9}{36} - \frac{7}{36} = \frac{9-7}{36} = \frac{2}{36} $$

г) $$ \frac{258}{100} - \frac{16}{100} = \frac{258-16}{100} = \frac{242}{100} = 2 \frac{42}{100} = 2 \frac{21}{50} $$

Ответ: $$ \frac{3}{7}; \frac{5}{12}; \frac{2}{36}; 2 \frac{21}{50} $$