2. Сократите дробь: а) \(\frac{2b^4}{8b^6}\); б) \(\frac{6a^2x^4}{9a^2x^5}\); в) \(\frac{-5pq^2}{10pq^7}\); г) \(\frac{81x^{12}y^{12}}{18x^{11}y^8}\).

1. \(\frac{2b^4}{8b^6}=\frac{1}{4b^2}\).
2. \(\frac{6a^2x^4}{9a^2x^5}=\frac{2}{3x}\).
3. \(\frac{-5pq^2}{10pq^7}=-\frac{1}{2q^5}\).
4. \(\frac{81x^{12}y^{12}}{18x^{11}y^8}=\frac{9xy^4}{2}\).

Ответ: а) \(\frac{1}{4b^2}\); б) \(\frac{2}{3x}\); в) \(-\frac{1}{2q^5}\); г) \(\frac{9xy^4}{2}\).