Вычислите: 1) 8 8/13 + 6 5/13; 2) 1 3/5 − 4/5; 3) 7/11 + 8/11; 4) 6 4/9 − 4; 5) 5 9/17 + 7 12/17; 6) 1 8/13 − 9/13; 7) 10/16 + 9/16; 8) 8 3/11 − 7 5/11.

1. \(8\frac{8}{13}+6\frac{5}{13}=14+\frac{13}{13}=15\).
2. \(1\frac{3}{5}-\frac{4}{5}=\frac{8}{5}-\frac{4}{5}=\frac{4}{5}\).
3. \(\frac{7}{11}+\frac{8}{11}=\frac{15}{11}=1\frac{4}{11}\).
4. \(6\frac{4}{9}-4=2\frac{4}{9}\).
5. \(5\frac{9}{17}+7\frac{12}{17}=12+\frac{21}{17}=13\frac{4}{17}\).
6. \(1\frac{8}{13}-\frac{9}{13}=\frac{21}{13}-\frac{9}{13}=\frac{12}{13}\).
7. \(\frac{10}{16}+\frac{9}{16}=\frac{19}{16}=1\frac{3}{16}\).
8. \(8\frac{3}{11}-7\frac{5}{11}=\frac{91}{11}-\frac{82}{11}=\frac{9}{11}\).

Ответ: 1) 15; 2) \(\frac{4}{5}\); 3) \(1\frac{4}{11}\); 4) \(2\frac{4}{9}\); 5) \(13\frac{4}{17}\); 6) \(\frac{12}{13}\); 7) \(1\frac{3}{16}\); 8) \(\frac{9}{11}\).