Ответ:

  1. \(1\frac{1}{35}\cdot(7-5\frac{4}{9})=\frac{36}{35}\cdot(7-\frac{49}{9})=\frac{36}{35}\cdot\frac{14}{9}=\frac{8}{5}=1\frac{3}{5}\).
  2. \((4,5:1,8-1,05)\cdot2,4=(2,5-1,05)\cdot2,4=1,45\cdot2,4=3,48\).

Ответ: а) \(1\frac{3}{5}\); б) 3,48.