1. Приведите дробь 2/5 к знаменателю 15; 35; 125.

\(\frac{2}{5}=\frac{2\cdot3}{5\cdot3}=\frac{6}{15}\); \(\frac{2}{5}=\frac{2\cdot7}{5\cdot7}=\frac{14}{35}\); \(\frac{2}{5}=\frac{2\cdot25}{5\cdot25}=\frac{50}{125}\).

Ответ: \(\frac{6}{15};\ \frac{14}{35};\ \frac{50}{125}\).