1) 13 5/7 - 12 5/7 = 1 2) 26 5/16 - 19 3/16 = 7 4/16 3) 7 2/16 - 1 = 6 2/16 = 6 1/8

Решение:

1. \( 13 \frac{5}{7} - 12 \frac{5}{7} = (13-12) + (\frac{5}{7} - \frac{5}{7}) = 1 + 0 = 1 \)
2. \( 26 \frac{5}{16} - 19 \frac{3}{16} = (26-19) + (\frac{5}{16} - \frac{3}{16}) = 7 + \frac{2}{16} = 7 \frac{2}{16} \)
3. \( 7 \frac{2}{16} - 1 = (7-1) + \frac{2}{16} = 6 + \frac{2}{16} = 6 \frac{2}{16} \). Сократим дробь \( \frac{2}{16} = \frac{1}{8} \), поэтому \( 6 \frac{2}{16} = 6 \frac{1}{8} \).

Ответ: 1; 7 2/16; 6 1/8.