8. Вычислите: 1) 7 14/15 + 2 1/15; 2) 9 24/27 + 12 13/27; 3) 1 − 12/19; 4) 8 − 3 6/15; 5) 12 − 11 6/11; 6) 16 3/13 − 6 8/13; 7) 13 4/9 − 2 8/9; 8) 10 7/16 − 4 12/16; 9) 29 49/53 − 8 49/53; 10) (20 16/25 + 13 9/25) − (23 4/14 + 7 13/14).

1. \(7\frac{14}{15}+2\frac{1}{15}=9\frac{15}{15}=10\).
2. \(9\frac{24}{27}+12\frac{13}{27}=21\frac{37}{27}=22\frac{10}{27}\).
3. \(1-\frac{12}{19}=\frac{19}{19}-\frac{12}{19}=\frac{7}{19}\).
4. \(8-3\frac{6}{15}=7\frac{15}{15}-3\frac{6}{15}=4\frac{9}{15}=4\frac{3}{5}\).
5. \(12-11\frac{6}{11}=11\frac{11}{11}-11\frac{6}{11}=\frac{5}{11}\).
6. \(16\frac{3}{13}-6\frac{8}{13}=15\frac{16}{13}-6\frac{8}{13}=9\frac{8}{13}\).
7. \(13\frac{4}{9}-2\frac{8}{9}=12\frac{13}{9}-2\frac{8}{9}=10\frac{5}{9}\).
8. \(10\frac{7}{16}-4\frac{12}{16}=9\frac{23}{16}-4\frac{12}{16}=5\frac{11}{16}\).
9. \(29\frac{49}{53}-8\frac{49}{53}=21\).
10. \((20\frac{16}{25}+13\frac{9}{25})-(23\frac{4}{14}+7\frac{13}{14})=34-(30\frac{17}{14})=34-31\frac{3}{14}=2\frac{11}{14}\).

Ответ: 1) 10; 2) 22 10/27; 3) 7/19; 4) 4 3/5; 5) 5/11; 6) 9 8/13; 7) 10 5/9; 8) 5 11/16; 9) 21; 10) 2 11/14.