391. 1) (2x³-3x²+3x-1)·4x²y²;

Решение:

• 1) \( (2x^3-3x^2+3x-1) \cdot 4x^2y^2 = 8x^5y^2 - 12x^4y^2 + 12x^3y^2 - 4x^2y^2 \)
• 2) \( (8a^3 - 4a^2b^2 - 3ab^2 + b^3) \cdot (-2a^2b) = -16a^5b + 8a^4b^3 + 6a^3b^3 - 2a^2b^4 \)
• 3) \( (-2a^3x+5a^2x^2-5ax^3+3x^4) \cdot (-3ax^2) = 6a^4x^3 - 15a^3x^4 + 15a^2x^5 - 9ax^6 \)
• 4) \( (4xy^2z-7x^2yz^2+3x^2yz) \cdot (-5xyz) = -20x^2y^3z^2 + 35x^3y^2z^3 - 15x^3y^2z^2 \)