3) 36a⁸/25b⁶ * 15b²/27a⁴;

3) $$\frac{36a^8}{25b^6} \cdot \frac{15b^2}{27a^4} = \frac{36a^8 \cdot 15b^2}{25b^6 \cdot 27a^4} = \frac{4a^8 \cdot 3b^2}{5b^6 \cdot 3a^4} = \frac{4a^{8-4}}{5b^{6-2}} = \frac{4a^4}{5b^4}$$

Ответ: 4a⁴/5b⁴