1. Сократите: 1) 5/25; 10/100; 25/30; 10/200; 15/45; 25/35. 4) 5/25; 10/100; 25/30; 10/200; 15/45; 25/35.

Делим числитель и знаменатель каждой дроби на их общий делитель.

1. \(\frac{5}{25}=\frac{1}{5}\); \(\frac{10}{100}=\frac{1}{10}\); \(\frac{25}{30}=\frac{5}{6}\); \(\frac{10}{200}=\frac{1}{20}\); \(\frac{15}{45}=\frac{1}{3}\); \(\frac{25}{35}=\frac{5}{7}\).
2. \(\frac{5}{25}=\frac{1}{5}\); \(\frac{10}{100}=\frac{1}{10}\); \(\frac{25}{30}=\frac{5}{6}\); \(\frac{10}{200}=\frac{1}{20}\); \(\frac{15}{45}=\frac{1}{3}\); \(\frac{25}{35}=\frac{5}{7}\).

Ответ: 1) \(\frac15;\frac1{10};\frac56;\frac1{20};\frac13;\frac57\). 4) \(\frac15;\frac1{10};\frac56;\frac1{20};\frac13;\frac57\).