5.300 в) $$9\frac{5}{7} - 3\frac{6}{7} = (9 - 3) + (\frac{5}{7} - \frac{6}{7}) = 6 - \frac{1}{7} = 5\frac{7}{7} - \frac{1}{7} = 5\frac{6}{7}$$
5.301 в) $$5\frac{7}{15} +8\frac{4}{15} = (5 + 8) + (\frac{7}{15} + \frac{4}{15}) = 13 + \frac{11}{15} = 13\frac{11}{15}$$
Ответ: 5.300 в) $$5\frac{6}{7}$$; 5.301 в) $$13\frac{11}{15}$$