$$13\frac{5}{7} - 12\frac{5}{7} = (13 - 12) + (\frac{5}{7} - \frac{5}{7}) = 1 + 0 = 1$$
$$26\frac{5}{16} - 19\frac{3}{16} - 1 = (26 - 19) + (\frac{5}{16} - \frac{3}{16}) - 1 = 7 + \frac{2}{16} - 1 = 6 + \frac{2}{16} = 6\frac{2}{16}$$
$$6\frac{2}{16} = 6\frac{1}{8}$$
Ответ: $$6\frac{1}{8}$$