Ответ:

\[\left(\frac{4}{3}\right)^2=\frac{16}{9},\qquad \frac{8}{9}-\frac{16}{9}=-\frac{8}{9}.\]

\[4.8:\left(-\frac{8}{9}\right)=\frac{24}{5}\cdot\left(-\frac{9}{8}\right)=-\frac{27}{10}=-2.7.\]

Ответ: \(-2.7\).