Ответ:

  1. а) \(\frac{16}{33}:\frac{55}{64}=\frac{16}{33}\cdot\frac{64}{55}=\frac{1024}{1815}\).

  2. б) \(\frac{17}{28}\cdot\frac{42}{51}=\frac{17\cdot3}{2\cdot51}=\frac{1}{2}\).

  3. в) \(\frac{23}{33}:\frac{46}{77}=\frac{23}{33}\cdot\frac{77}{46}=\frac{7}{6}\).

  4. г) \(\frac{2}{5}:\frac{6}{55}=\frac{2}{5}\cdot\frac{55}{6}=\frac{11}{3}\).

Ответ: а) \(\frac{1024}{1815}\); б) \(\frac{1}{2}\); в) \(\frac{7}{6}\); г) \(\frac{11}{3}\).