Ответ:
\[2\frac{4}{9}=\frac{22}{9},\qquad \frac{2}{3}-\frac{2}{7}=\frac{14-6}{21}=\frac{8}{21}.\]
\[\frac{22}{9}:\frac{8}{21}=\frac{22}{9}\cdot\frac{21}{8}=\frac{77}{12}.\]
Ответ: \(\frac{77}{12}\).
\[2\frac{4}{9}=\frac{22}{9},\qquad \frac{2}{3}-\frac{2}{7}=\frac{14-6}{21}=\frac{8}{21}.\]
\[\frac{22}{9}:\frac{8}{21}=\frac{22}{9}\cdot\frac{21}{8}=\frac{77}{12}.\]
Ответ: \(\frac{77}{12}\).