2) Сократите дробь: а) \(\frac{5a^2}{6a}\); б) \(\frac{9b^4}{10b^3}\); в) \(\frac{-5c^4}{10c^5}\).

1. а) \(\frac{5a^2}{6a}=\frac{5a}{6}\).
2. б) \(\frac{9b^4}{10b^3}=\frac{9b}{10}\).
3. в) \(\frac{-5c^4}{10c^5}=-\frac{1}{2c}\).

Ответ: а) \(\frac{5a}{6}\); б) \(\frac{9b}{10}\); в) \(-\frac{1}{2c}\).