3. Найдите сумму смешанных чисел: A) $$5\frac{1}{5}+11\frac{3}{5}=$$ Б) $$9\frac{3}{4}+2\frac{2}{12}=$$ B) $$13\frac{1}{4}+18\frac{8}{9}=$$

Решим предложенные примеры, следуя образцу:

A) $$5\frac{1}{5}+11\frac{3}{5} = (5 + 11) + (\frac{1}{5} + \frac{3}{5}) = 16 + \frac{4}{5} = 16\frac{4}{5}$$

Б) $$9\frac{3}{4}+2\frac{2}{12} = 9\frac{3}{4}+2\frac{1}{6} = (9 + 2) + (\frac{3}{4} + \frac{1}{6}) = 11 + (\frac{9}{12} + \frac{2}{12}) = 11 + \frac{11}{12} = 11\frac{11}{12}$$

B) $$13\frac{1}{4}+18\frac{8}{9} = (13 + 18) + (\frac{1}{4} + \frac{8}{9}) = 31 + (\frac{9}{36} + \frac{32}{36}) = 31 + \frac{41}{36} = 31 + 1\frac{5}{36} = 32\frac{5}{36}$$