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