(2019^100 + 2019^96 +...+ 2019^4 + 1)/|x - 2019| = 2019^104 - 1/2019^4 -1

 (2019 mũ 100 + 2019 mũ 96+...+2019 mũ 4+1)/|x-2019|=2019 mũ 104 -1/2019 mũ 4 -1