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2019+2× (1+2+3......2019)​

Răspuns :

Răspuns:

=2019+2x((2019x2020):2)

=2019+2x2039190

=2019+4078380

=4080399

Explicație pas cu pas:

2019+2•a

a=1+2+3+.......+2019=2019•(2019+1)÷2

=2019•2020÷2

=4078380÷2

=2039190

2019+2•2039190=2019+4078380

=4080399