Ответ:

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