Ответ:
а) \(3\frac{5}{7}-1\frac{5}{7}=2\).
\(4\frac{3}{8}-2+1\frac{5}{8}=\left(4\frac{3}{8}+1\frac{5}{8}\right)-2=6-2=4\).
Ответ: \(4\).
б) \(20\frac{3}{4}-19\frac{3}{4}=1\).
\(12\frac{7}{12}-4\frac{5}{12}-1=8\frac{2}{12}-1=8\frac{1}{6}-1=7\frac{1}{6}\).
Ответ: \(7\frac{1}{6}\).
