1. Сократите дроби: а) \(\frac{a^2b^5}{ab^7}\); б) \(-\frac{63xy^5}{81xy^4}\); в) \(\frac{30a^2c^3}{48a^3c^2}\); г) \(\frac{11p^6q^6}{37p^4q^4}\).

1. а) \(\frac{a^2b^5}{ab^7}=\frac{a^{2-1}}{b^{7-5}}=\frac{a}{b^2}\).
2. б) \(-\frac{63xy^5}{81xy^4}=-\frac{7y}{9}\).
3. в) \(\frac{30a^2c^3}{48a^3c^2}=\frac{5c}{8a}\).
4. г) \(\frac{11p^6q^6}{37p^4q^4}=\frac{11p^2q^2}{37}\).

Ответ: а) \(\frac{a}{b^2}\); б) \(-\frac{7y}{9}\); в) \(\frac{5c}{8a}\); г) \(\frac{11p^2q^2}{37}\).