a)
\[14 - 1\frac{5}{9} = 14 - \frac{14}{9} = \frac{126}{9} - \frac{14}{9} = \frac{112}{9} = 12 \frac{4}{9}\]
б)
\[1 \frac{1}{2} : 1 \frac{3}{25} = \frac{3}{2} : \frac{28}{25} = \frac{3}{2} \cdot \frac{25}{28} = \frac{75}{56} = 1 \frac{19}{56}\]
Ответ: a) 12 4/9, б) 1 19/56