Ответ:
\[-\frac{5}{16}\cdot\frac{4}{7}-\frac{9}{28}:\left(-\frac{6}{4}\right)=-\frac{5}{28}+\frac{9}{28}\cdot\frac{4}{6}=-\frac{5}{28}+\frac{3}{14}=\frac{1}{28}.\]
Ответ: б) \(\frac{1}{28}\).
\[-\frac{5}{16}\cdot\frac{4}{7}-\frac{9}{28}:\left(-\frac{6}{4}\right)=-\frac{5}{28}+\frac{9}{28}\cdot\frac{4}{6}=-\frac{5}{28}+\frac{3}{14}=\frac{1}{28}.\]
Ответ: б) \(\frac{1}{28}\).