3x³y²(-2x²)

4. $$3x^3y^2(-2x^2) = 3 \cdot (-2) \cdot x^3 \cdot x^2 \cdot y^2 = -6x^{3+2}y^2 = -6x^5y^2$$

Ответ: $$-6x^5y^2$$