1) Сократите дроби: 9/5, 90/9, 15/3, 17/5, 75/8, 55/4, 53/6, 49/9.

\(\frac{9}{5}=1\frac{4}{5}\); \(\frac{90}{9}=10\); \(\frac{15}{3}=5\); \(\frac{17}{5}=3\frac{2}{5}\); \(\frac{75}{8}=9\frac{3}{8}\); \(\frac{55}{4}=13\frac{3}{4}\); \(\frac{53}{6}=8\frac{5}{6}\); \(\frac{49}{9}=5\frac{4}{9}\).