Ответ:

  1. \(2x^2y(2x-3y)\);
  2. \(5a(a^2-3ab+4b^2)\);
  3. \(3n(2mn-3n^2+4m^2n)\);
  4. \(-3xy(y+5x+7xy)\).

Жауап: 1) \(2x^2y(2x-3y)\); 2) \(5a(a^2-3ab+4b^2)\); 3) \(3n(2mn-3n^2+4m^2n)\); 4) \(-3xy(y+5x+7xy)\).