[tex][(\frac{2}{3})^2 + 1]:13=\\ \\ =(\frac{4}{9}+1):13=\\ \\ =(\frac{4}{9}+\frac{9}{9}):13=\\ \\ =\frac{13}{9}\cdot \frac{1}{13}=\\ \\=\frac{1}{9}[/tex]
