Explicație pas cu pas:
2019+2*(1+2+3+...+2018)=
2019+2*2018*2019/2 =2019+2018*2019
=2019*2019=2019²
Explicație pas cu pas:
2019 + 2 × (1+2+3+..+2018) =
2019 + 2 × 2018 × (2018+1) : 2 =
2019 + 2018 × 2019 =
2019 × (1 + 2018) =
2019 × 2019 =
2019^2
________
2019^2 = 2019 la puterea a 2-a