Ответ:
\(2\frac{1}{5}+3\frac{2}{5}=5\frac{3}{5}\).
\(7\frac{14}{15}-2\frac{4}{15}=5\frac{10}{15}=5\frac{2}{3}\).
\(10\frac{4}{7}-6\frac{1}{7}=4\frac{3}{7}\).
Ответ: \(5\frac{3}{5};\ 5\frac{2}{3};\ 4\frac{3}{7}\).
\(2\frac{1}{5}+3\frac{2}{5}=5\frac{3}{5}\).
\(7\frac{14}{15}-2\frac{4}{15}=5\frac{10}{15}=5\frac{2}{3}\).
\(10\frac{4}{7}-6\frac{1}{7}=4\frac{3}{7}\).
Ответ: \(5\frac{3}{5};\ 5\frac{2}{3};\ 4\frac{3}{7}\).