Ответ:
а) \(1\frac{2}{5}+3\frac{7}{15}=4+\frac{6}{15}+\frac{7}{15}=4\frac{13}{15}\).
б) \(4\frac{3}{14}-1\frac{2}{21}=3+\frac{9}{42}-\frac{4}{42}=3\frac{5}{42}\).
в) \(3\frac{5}{6}+2\frac{7}{15}-1\frac{29}{30}=4+\frac{25}{30}+\frac{14}{30}-\frac{29}{30}=4\frac{10}{30}=4\frac{1}{3}\).
Ответ: а) \(4\frac{13}{15}\); б) \(3\frac{5}{42}\); в) \(4\frac{1}{3}\).
