Ответ:
а) \(12\frac{5}{12}+4\frac{1}{8}-4\frac{2}{3}=12\frac{10}{24}+4\frac{3}{24}-4\frac{16}{24}=12\frac{21}{24}=12\frac{7}{8}\).
б) \(5\frac{9}{10}+\left(5-2\frac{8}{15}\right)=5\frac{9}{10}+2\frac{7}{15}=7\frac{41}{30}=8\frac{11}{30}\).
Ответ: а) \(12\frac{7}{8}\); б) \(8\frac{11}{30}\).
