86. Выполните действие: a) 4\frac{5}{6}+2\frac{3}{8}; 6) 7\frac{5}{18}-1\frac{7}{12}; B) 3\frac{4}{9}+2\frac{2}{7}; r) 5\frac{3}{14}-1\frac{1}{21}.

а) $$4\frac{5}{6}+2\frac{3}{8} = 4\frac{20}{24}+2\frac{9}{24} = 6\frac{29}{24} = 7\frac{5}{24}$$

Ответ:$$7\frac{5}{24}$$

б) $$7\frac{5}{18}-1\frac{7}{12} = 7\frac{10}{36}-1\frac{21}{36} = 6\frac{46}{36}-1\frac{21}{36} = 5\frac{25}{36}$$

Ответ:$$5\frac{25}{36}$$

в) $$3\frac{4}{9}+2\frac{2}{7} = 3\frac{28}{63}+2\frac{18}{63} = 5\frac{46}{63}$$

Ответ:$$5\frac{46}{63}$$

г) $$5\frac{3}{14}-1\frac{1}{21} = 5\frac{9}{42}-1\frac{2}{42} = 4\frac{7}{42}=4\frac{1}{6}$$

Ответ:$$4\frac{1}{6}$$