391. 1) (2x³-3x²+3x-1)·4x²y³; 2) (8a³-4a²b²-3ab²+5b³)·(-2a²b); 3) (-2a³x + 5a²x² - 5ax³ +3x⁴)·(-3ax²); 4) (4xyz-7xyz² + 3x²yz)·(-5xyz).

Решение:

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

Ответ: 1) \( 8x^5y^3-12x^4y^3+12x^3y^3-4x^2y^3 \); 2) \( -16a^5b+8a^4b^3+6a^3b^3-10a^2b^4 \); 3) \( 6a^4x^3-15a^3x^4+15a^2x^5-9ax^6 \); 4) \( -20x^2y^2z^2+35x^2y^2z^3-15x^3y^2z^2 \).