Сравните числа: 11/7 и 13/9.

\[\frac{11}{7}\ \ и\ \frac{13}{9} \Longrightarrow \frac{99\ и\ 91}{63} \Longrightarrow \frac{99}{63} > \frac{91}{63} \Longrightarrow\]

\[\Longrightarrow \frac{11}{7} > \frac{13}{9}.\]