- \(\left(\frac{3}{16}+\frac{1}{5}\right):\frac{1}{32}=\frac{31}{80}\cdot32=\frac{62}{5}=12\frac{2}{5}\).
- \(\left(\frac{7}{8}-2\frac{3}{20}\right):\frac{1}{48}=\left(\frac{35}{40}-\frac{92}{40}\right)\cdot48=-\frac{57}{40}\cdot48=-\frac{342}{5}=-68\frac{2}{5}\).
- \(\frac{1}{\frac{1}{28}-\frac{1}{35}}=\frac{1}{\frac{5-4}{140}}=140\).
Ответ: 1) \(12\frac{2}{5}\); 2) \(-68\frac{2}{5}\); 3) 140.