Ответ:

а) \(\frac{3\frac{3}{8}-2\frac{11}{12}}{2,2\cdot0,25\cdot40}=\frac{\frac{27}{8}-\frac{35}{12}}{22}=\frac{\frac{11}{24}}{22}=\frac{11}{528}=\frac{1}{48}\).

б) \(\frac{17\frac{2}{3}-15\frac{1}{6}}{2,5\cdot0,2\cdot0,05}=\frac{\frac{53}{3}-\frac{91}{6}}{\frac{1}{8}}=\frac{\frac{5}{2}}{\frac{1}{8}}=20\).

Ответ: а) \(\frac{1}{48}\); б) \(20\).