а) \(\frac{40}{25}=\frac{8}{5}=1\frac{3}{5}\); \(\frac{72}{16}=\frac{9}{2}=4\frac{1}{2}\); \(\frac{120}{64}=\frac{15}{8}=1\frac{7}{8}\).
б) \(1\frac{9}{11}=\frac{1\cdot11+9}{11}=\frac{20}{11}\); \(3\frac{7}{8}=\frac{3\cdot8+7}{8}=\frac{31}{8}\); \(9\frac{7}{10}=\frac{9\cdot10+7}{10}=\frac{97}{10}\).