391. 1) (2x³-3x²+3x-1) 4x²y²; 2) (8a³-4a²b² - 3ab² + 5b³).(-2a²b); 3) (-2a³x+5a²x² - 5ax³+3x⁴).(-3ax²); 4) (4xy²z-7x²yz²+3x²yz).(-5xyz).

391.

1. $$ (2x^3 - 3x^2 + 3x - 1) \cdot 4x^2y^2 = 8x^5y^2 - 12x^4y^2 + 12x^3y^2 - 4x^2y^2 $$Ответ: $$8x^5y^2 - 12x^4y^2 + 12x^3y^2 - 4x^2y^2$$
2. $$ (8a^3 - 4a^2b^2 - 3ab^2 + 5b^3) \cdot (-2a^2b) = -16a^5b + 8a^4b^3 + 6a^3b^3 - 10a^2b^4 $$Ответ: $$-16a^5b + 8a^4b^3 + 6a^3b^3 - 10a^2b^4$$
3. $$ (-2a^3x + 5a^2x^2 - 5ax^3 + 3x^4) \cdot (-3ax^2) = 6a^4x^3 - 15a^3x^4 + 15a^2x^5 - 9ax^6 $$Ответ: $$6a^4x^3 - 15a^3x^4 + 15a^2x^5 - 9ax^6$$
4. $$ (4xy^2z - 7x^2yz^2 + 3x^2yz) \cdot (-5xyz) = -20x^2y^3z^2 + 35x^3y^2z^3 - 15x^3y^2z^2 $$Ответ: $$-20x^2y^3z^2 + 35x^3y^2z^3 - 15x^3y^2z^2$$