4. Найдите значение выражения: А. 5 3/7 + 2 7/8; Б. 3 2/7 + 4 3/4; В. 7 11/15 − 4 2/5; Г. 9 7/12 − 6 3/4.

1. \(5\frac{3}{7}+2\frac{7}{8}=7+\frac{3}{7}+\frac{7}{8}=7+\frac{24}{56}+\frac{49}{56}=8\frac{17}{56}\).
2. \(3\frac{2}{7}+4\frac{3}{4}=7+\frac{2}{7}+\frac{3}{4}=7+\frac{8}{28}+\frac{21}{28}=8\frac{1}{28}\).
3. \(7\frac{11}{15}-4\frac{2}{5}=3+\frac{11}{15}-\frac{6}{15}=3\frac{1}{3}\).
4. \(9\frac{7}{12}-6\frac{3}{4}=3+\frac{7}{12}-\frac{9}{12}=2\frac{5}{6}\).

Ответ: А. \(8\frac{17}{56}\); Б. \(8\frac{1}{28}\); В. \(3\frac{1}{3}\); Г. \(2\frac{5}{6}\).