Ответ:

а)

bcb·c
\(\frac{3}{8}\)\(\frac{3}{2}\)\(\frac{9}{16}\)
\(\frac{3}{4}\)\(\frac{4}{7}\)\(\frac{9}{21}\)
\(\frac{8}{7}\)\(\frac{2}{3}\)\(\frac{16}{21}\)

б)

bcb:c
\(\frac{5}{6}\)\(\frac{4}{9}\)\(\frac{15}{8}\)
\(\frac{7}{10}\)\(\frac{7}{5}\)\(\frac{1}{2}\)
\(\frac{1}{2}\)\(\frac{5}{4}\)\(\frac{2}{5}\)