Ответ:
а) \(3\frac{5}{8}+1\frac{2}{3}=4+\left(\frac{5}{8}+\frac{2}{3}\right)=4+\left(\frac{15}{24}+\frac{16}{24}\right)=4\frac{31}{24}=5\frac{7}{24}\).
б) \(4\frac{4}{9}-2\frac{5}{6}=2+\left(\frac{4}{9}-\frac{5}{6}\right)=2+\left(\frac{8}{18}-\frac{15}{18}\right)=1\frac{11}{18}\).
в) \(6\frac{3}{40}-4\frac{8}{15}=2+\left(\frac{3}{40}-\frac{8}{15}\right)=1\frac{13}{24}\).
Тогда \(6\frac{7}{12}+1\frac{13}{24}=7+\left(\frac{14}{24}+\frac{13}{24}\right)=7\frac{27}{24}=8\frac{1}{8}\).
Ответ: а) \(5\frac{7}{24}\); б) \(1\frac{11}{18}\); в) \(8\frac{1}{8}\).
