4) Сократите дробь: а) 2³/2⁵; б) 3⁶/3⁴; в) 7³/49; г) 625/5⁵.

1. \(\dfrac{2^3}{2^5}=2^{3-5}=2^{-2}=\dfrac{1}{4}\).
2. \(\dfrac{3^6}{3^4}=3^{6-4}=3^2=9\).
3. \(\dfrac{7^3}{49}=\dfrac{7^3}{7^2}=7\).
4. \(\dfrac{625}{5^5}=\dfrac{5^4}{5^5}=\dfrac{1}{5}\).

Ответ: а) \(\dfrac{1}{4}\); б) \(9\); в) \(7\); г) \(\dfrac{1}{5}\).