3. Сократите дробь: а) \(\frac{a^3b^5}{ab^7}\); б) \(\frac{-63xy^5}{81xy^4}\); в) \(\frac{30a^2c^3}{48a^3c^2}\); г) \(\frac{111p^6q^6}{37p^4q^4}\).

1. \(\frac{a^3b^5}{ab^7}=\frac{a^2}{b^2}\);
2. \(\frac{-63xy^5}{81xy^4}=-\frac{7y}{9}\);
3. \(\frac{30a^2c^3}{48a^3c^2}=\frac{5c}{8a}\);
4. \(\frac{111p^6q^6}{37p^4q^4}=3p^2q^2\).

Ответ: а) \(\frac{a^2}{b^2}\); б) \(-\frac{7y}{9}\); в) \(\frac{5c}{8a}\); г) \(3p^2q^2\).