50. Найдите сумму: 1) 3 7/9 + 5 1/6; 2) 8 7/16 + 3 3/10; 3) 6 8/12 + 9 7/18; 4) 9 3/16 + 4 7/12 + 3 5/24.

1. \(3\frac{7}{9}+5\frac{1}{6}=8+\frac{14}{18}+\frac{3}{18}=8\frac{17}{18}\).
2. \(8\frac{7}{16}+3\frac{3}{10}=11+\frac{35}{80}+\frac{24}{80}=11\frac{59}{80}\).
3. \(6\frac{8}{12}+9\frac{7}{18}=15+\frac{12}{18}+\frac{7}{18}=16\frac{1}{18}\).
4. \(9\frac{3}{16}+4\frac{7}{12}+3\frac{5}{24}=16+\frac{9}{48}+\frac{28}{48}+\frac{10}{48}=16\frac{47}{48}\).

Ответ: 1) 8 17/18; 2) 11 59/80; 3) 16 1/18; 4) 16 47/48.