Решение:
- \( \frac{3}{16} + \frac{1}{5} = \frac{3 \cdot 5 + 1 \cdot 16}{16 \cdot 5} = \frac{15 + 16}{80} = \frac{31}{80} \)
- \( \frac{31}{80} : \frac{1}{32} = \frac{31}{80} \cdot 32 = \frac{31 \cdot 32}{80} = \frac{31 \cdot 2}{5} = \frac{62}{5} \)
- \( \frac{7}{8} - \frac{2}{20} = \frac{7}{8} - \frac{1}{10} = \frac{7 \cdot 5 - 1 \cdot 4}{40} = \frac{35 - 4}{40} = \frac{31}{40} \)
- \( \frac{31}{40} : \frac{1}{48} = \frac{31}{40} \cdot 48 = \frac{31 \cdot 48}{40} = \frac{31 \cdot 6}{5} = \frac{186}{5} \)
- \( \frac{28}{35} = \frac{4}{5} \)
- \( \frac{4}{5} : \frac{1}{91} = \frac{4}{5} \cdot 91 = \frac{364}{5} \)
Ответ: 1) \( \frac{62}{5} \) 2) \( \frac{186}{5} \) 3) \( \frac{364}{5} \)