3. Найдите значение выражений. a) 12 5/7 + 8/8; б) 6 4/13 + 5 8/26; в) 4 8/7 - 3 6/8; г) 4 6/3 - 3 4/6; д) 9 1/5 * 2/9; e) 3 2/7 * 1/35; ж) 2/15 : 7/15; з) 3 3/5 : 2 7/10.

a) \( 12 \frac{5}{7} + \frac{8}{8} = 12 \frac{5}{7} + 1 = 13 \frac{5}{7} \) б) \( 6 \frac{4}{13} + 5 \frac{8}{26} = 6 \frac{8}{26} + 5 \frac{8}{26} = 11 \frac{16}{26} = 11 \frac{8}{13} \) в) \( 4 \frac{8}{7} - 3 \frac{6}{8} = 4 \frac{64}{56} - 3 \frac{42}{56} = 1 \frac{22}{56} = 1 \frac{11}{28} \) г) \( 4 \frac{6}{3} - 3 \frac{4}{6} = 4 + 2 - 3 \frac{2}{3} = 6 - 3 \frac{2}{3} = 2 \frac{1}{3} \) д) \( 9 \frac{1}{5} \cdot \frac{2}{9} = \frac{46}{5} \cdot \frac{2}{9} = \frac{92}{45} = 2 \frac{2}{45} \) e) \( 3 \frac{2}{7} \cdot \frac{1}{35} = \frac{23}{7} \cdot \frac{1}{35} = \frac{23}{245} \) ж) \( \frac{2}{15} : \frac{7}{15} = \frac{2}{15} \cdot \frac{15}{7} = \frac{2}{7} \) з) \( 3 \frac{3}{5} : 2 \frac{7}{10} = \frac{18}{5} : \frac{27}{10} = \frac{18}{5} \cdot \frac{10}{27} = \frac{2}{1} \cdot \frac{2}{3} = \frac{4}{3} = 1 \frac{1}{3} \)