196. Выполните действия: 1) 7+\frac{8}{19}; 4) 12\frac{8}{13}-8\frac{4}{13}; 2) \frac{8}{68}+9; 5) 5\frac{17}{21}-3\frac{8}{21}+4\frac{7}{21}; 3) 3\frac{5}{16}+4\frac{7}{16}; 6) 14\frac{8}{10}+5\frac{1}{10}-6\frac{7}{10}.

Выполним действия:

1. $$7+\frac{8}{19} = 7\frac{8}{19}$$
2. $$\frac{8}{68}+9 = 9\frac{8}{68} = 9\frac{2}{17}$$
3. $$3\frac{5}{16}+4\frac{7}{16} = (3+4) + (\frac{5}{16}+\frac{7}{16}) = 7 + \frac{12}{16} = 7 + \frac{3}{4} = 7\frac{3}{4}$$
4. $$12\frac{8}{13}-8\frac{4}{13} = (12-8) + (\frac{8}{13}-\frac{4}{13}) = 4 + \frac{4}{13} = 4\frac{4}{13}$$
5. $$5\frac{17}{21}-3\frac{8}{21}+4\frac{7}{21} = (5-3+4) + (\frac{17}{21}-\frac{8}{21}+\frac{7}{21}) = 6 + \frac{16}{21} = 6\frac{16}{21}$$
6. $$14\frac{8}{10}+5\frac{1}{10}-6\frac{7}{10} = (14+5-6) + (\frac{8}{10}+\frac{1}{10}-\frac{7}{10}) = 13 + \frac{2}{10} = 13 + \frac{1}{5} = 13\frac{1}{5}$$

Ответ: 1) $$7\frac{8}{19}$$; 2) $$9\frac{2}{17}$$; 3) $$7\frac{3}{4}$$; 4) $$4\frac{4}{13}$$; 5) $$6\frac{16}{21}$$; 6) $$13\frac{1}{5}$$