Сократите дроби: а) 25/30; б) 36/90; в) 84/210; г) 11/44.

1. \(\dfrac{25}{30}=\dfrac{25\div5}{30\div5}=\dfrac{5}{6}\).
2. \(\dfrac{36}{90}=\dfrac{36\div18}{90\div18}=\dfrac{2}{5}\).
3. \(\dfrac{84}{210}=\dfrac{84\div42}{210\div42}=\dfrac{2}{5}\).
4. \(\dfrac{11}{44}=\dfrac{11\div11}{44\div11}=\dfrac{1}{4}\).

Ответ: а) \(\dfrac{5}{6}\); б) \(\dfrac{2}{5}\); в) \(\dfrac{2}{5}\); г) \(\dfrac{1}{4}\).