👤

calculati: 2×(1+2+3+...+2019):2020

Răspuns :

2x(1+2+3+...+2019):2020
2x[(2019x(2019+1):2]:2020
2x(2019x2020:2):2020
2x(4078380:2):2020
2x2039190:2020
4078380:2020
=2019