484 3) ab cd 2 acd;

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

Ответ: $$ \frac{a^3b^2}{cd} $$