(²/₉ x²y) * (-9xy²)³ = (²/₉ x²y) * (-9)³ * x³ * (y²)³ = (²/₉ x²y) * (-729) * x³ * y⁶ = -162 x⁵y⁷
Ответ: -162 x⁵y⁷