Выполните действия: 8 3/7 − 2 1/7; 5 6/8 − 3 2/8; 7 3/11 − 2/11; 6 8/23 − 12/23; 5 7/9 + 3 4/9; 12 3/10 + 3 7/10; 10 3/5 + 6 4/5; 8 3/9 + 1 7/9; 12 7/8 + 3 7/8; 15 − 2 3/5; 19 − 5 6/13; 10 3/7 − 4 5/7.

1. \(8\frac{3}{7}-2\frac{1}{7}=6\frac{2}{7}\).
2. \(5\frac{6}{8}-3\frac{2}{8}=2\frac{4}{8}=2\frac{1}{2}\).
3. \(7\frac{3}{11}-\frac{2}{11}=7\frac{1}{11}-1=6\frac{1}{11}\).
4. \(6\frac{8}{23}-\frac{12}{23}=5\frac{31}{23}-\frac{12}{23}=5\frac{19}{23}\).
5. \(5\frac{7}{9}+3\frac{4}{9}=8\frac{11}{9}=9\frac{2}{9}\).
6. \(12\frac{3}{10}+3\frac{7}{10}=15+1=16\).
7. \(10\frac{3}{5}+6\frac{4}{5}=16\frac{7}{5}=17\frac{2}{5}\).
8. \(8\frac{3}{9}+1\frac{7}{9}=9\frac{10}{9}=10\frac{1}{9}\).
9. \(12\frac{7}{8}+3\frac{7}{8}=15\frac{14}{8}=16\frac{3}{4}\).
10. \(15-2\frac{3}{5}=12\frac{2}{5}\).
11. \(19-5\frac{6}{13}=13\frac{7}{13}\).
12. \(10\frac{3}{7}-4\frac{5}{7}=9\frac{10}{7}-4\frac{5}{7}=5\frac{5}{7}\).

Ответ: 6\(\frac{2}{7}\); 2\(\frac{1}{2}\); 6\(\frac{1}{11}\); 5\(\frac{19}{23}\); 9\(\frac{2}{9}\); 16; 17\(\frac{2}{5}\); 10\(\frac{1}{9}\); 16\(\frac{3}{4}\); 12\(\frac{2}{5}\); 13\(\frac{7}{13}\); 5\(\frac{5}{7}\).