Раздел «В»: 3/5 + 4/5; 1 − 2/7; 4 2/5 + 2 1/5; 3 8/11 − 1 6/11; 5/7 + 2.

1. \(\frac{3}{5}+\frac{4}{5}=\frac{7}{5}=1\frac{2}{5}\).
2. \(1-\frac{2}{7}=\frac{7}{7}-\frac{2}{7}=\frac{5}{7}\).
3. \(4\frac{2}{5}+2\frac{1}{5}=6\frac{3}{5}\).
4. \(3\frac{8}{11}-1\frac{6}{11}=2\frac{2}{11}\).
5. \(\frac{5}{7}+2=\frac{5}{7}+\frac{14}{7}=\frac{19}{7}=2\frac{5}{7}\).

Ответ: \(1\frac{2}{5};\ \frac{5}{7};\ 6\frac{3}{5};\ 2\frac{2}{11};\ 2\frac{5}{7}\).