Решим пример:
$$3\frac{1}{3} - 2\frac{7}{9} = 3\frac{3}{9} - 2\frac{7}{9} = 2\frac{12}{9} - 2\frac{7}{9} = \frac{5}{9};$$
$$(1\frac{1}{5})^2 = (\frac{6}{5})^2 = \frac{36}{25};$$
$$( \frac{5}{9})^2 = \frac{25}{81};$$
$$\frac{25}{81} : \frac{36}{25} = \frac{25}{81} \cdot \frac{25}{36} = \frac{625}{2916}$$.
Ответ: $$\frac{625}{2916}$$.