484 4) abc2. ab cd 2

4) $$ abc^2 \cdot (\frac{ab}{cd})^2 = abc^2 \cdot \frac{a^2b^2}{c^2d^2} = \frac{abc^2 \cdot a^2b^2}{c^2d^2} = \frac{a^3b^3}{d^2} $$

Ответ: $$ \frac{a^3b^3}{d^2} $$