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b) va rog cat de repede puteti suma lui Gauss

B Va Rog Cat De Repede Puteti Suma Lui Gauss class=

Răspuns :

1+2+3+...+2019=2019×(2019+1):2

=2019×2020:2

De aici sper ca stii :)))

2 x (1+2+3+...+2019) : 2020=

2 x (2019x2020)\2 : 2020=(simplific cu 2)

2019 x 2020 : 2020=

=2019 x 1

=2019

Succes!