\( \frac{26}{27} : \frac{39}{45} = \frac{26}{27} \cdot \frac{45}{39} \)
\( \frac{26}{27} \cdot \frac{45}{39} = \frac{2 \cdot 13}{3 \cdot 9} \cdot \frac{5 \cdot 9}{3 \cdot 13} = \frac{2 \cdot 5}{3 \cdot 3} = \frac{10}{9} \)
\( 2 - \frac{10}{9} = \frac{18}{9} - \frac{10}{9} = \frac{8}{9} \)
Ответ: 8/9