2. Сократите дробь: а) 56/70; б) 96/100; в) 42/90.

1. \(\frac{56}{70}=\frac{56:14}{70:14}=\frac{4}{5}\).
2. \(\frac{96}{100}=\frac{96:4}{100:4}=\frac{24}{25}\).
3. \(\frac{42}{90}=\frac{42:6}{90:6}=\frac{7}{15}\).

Ответ: а) \(\frac{4}{5}\); б) \(\frac{24}{25}\); в) \(\frac{7}{15}\).