Ответ:

\[0,8=\frac{4}{5},\qquad 1-\frac{2}{3}=\frac{1}{3}.\]

\[\frac{4}{5}:\frac{1}{3}=\frac{4}{5}\cdot3=\frac{12}{5}=2,4.\]

Ответ: 2,4.