33. Найдите значение выражения: а) 12 2/5 − 2 2/7 : 19/21; б) (12 2/5 − 2 2/7) · 19/21.

1. \(12\frac25=\frac{62}{5}\), \(2\frac27=\frac{16}{7}\).

   а) \(\frac{62}{5}-\frac{16}{7}:\frac{19}{21}=\frac{62}{5}-\frac{48}{19}=\frac{938}{95}=9\frac{83}{95}\).

   б) \((\frac{62}{5}-\frac{16}{7})\cdot\frac{19}{21}=\frac{354}{35}\cdot\frac{19}{21}=\frac{2242}{245}=9\frac{37}{245}\).

Ответ: а) \(9\frac{83}{95}\); б) \(9\frac{37}{245}\).