Ответ:
а) \(\frac{9}{7}:\left(-\frac{1}{36}\right)=\frac{9}{7}\cdot(-36)=-\frac{324}{7}\).
б) \(\frac{24}{49}:\frac{6}{7}=\frac{24}{49}\cdot\frac{7}{6}=\frac{4}{7}\).
\(\frac{4}{7}+\frac{1}{14}=\frac{8}{14}+\frac{1}{14}=\frac{9}{14}\).
Ответ: а) \(-\frac{324}{7}\); б) \(\frac{9}{14}\).
