Ответ:
а) \(1\frac{3}{7}+2\frac{5}{7}+1\frac{2}{7}+3\frac{6}{7}=9\frac{2}{7}\).
б) \(2\frac{2}{9}+1\frac{5}{9}+3\frac{7}{9}+1\frac{4}{9}=9\).
в) \(3\frac{2}{5}+1\frac{4}{5}+2\frac{3}{5}+1\frac{3}{5}=9\frac{2}{5}\).
г) \(1\frac{7}{10}+3\frac{3}{10}+2\frac{9}{10}+1\frac{1}{10}=9\).
Ответ: а) \(9\frac{2}{7}\); б) 9; в) \(9\frac{2}{5}\); г) 9.
