Ответ:
а) \(3\frac{4}{7}-2\frac{3}{5}=\frac{109}{35}-\frac{73}{35}=\frac{36}{35}=1\frac{1}{35}\).
б) \(6\frac{5}{6}+2\frac{3}{8}=8+\frac{20}{24}+\frac{9}{24}=8\frac{29}{24}=9\frac{5}{24}\).
в) \(4\frac{5}{14}+\left(5\frac{1}{12}-3\frac{4}{21}\right)=4\frac{5}{14}+\left(5\frac{7}{84}-3\frac{16}{84}\right)=4\frac{5}{14}+1\frac{55}{84}=5\frac{85}{84}=6\frac{1}{84}\).
Ответ: а) \(1\frac{1}{35}\); б) \(9\frac{5}{24}\); в) \(6\frac{1}{84}\).
