2.250 Найдите сумму: д) $$28\frac{5}{9} + 13\frac{3}{4}$$

д) $$28\frac{5}{9} + 13\frac{3}{4} = 28\frac{5\cdot4}{9\cdot4} + 13\frac{3\cdot9}{4\cdot9} = 28\frac{20}{36} + 13\frac{27}{36} = (28+13) + (\frac{20}{36} + \frac{27}{36}) = 41 + \frac{47}{36} = 41 + 1\frac{11}{36} = 42\frac{11}{36}$$

Ответ: $$42\frac{11}{36}$$