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Calculati:
(1+2+3+....+2018):2019

2×(1+2+3+....+2019):2020

Va rog dau coroana


Răspuns :

Răspuns:

Gauss ; s=(1+2018)×2018/2=2019×1009 ;    2019×1009:2019=1009;                                                2019×2018:2020

Explicație pas cu pas:

(1+2+3+...+2018)÷2019=1009

[(2018×2019):2]÷2019=1009

(1009×2019)÷2019=1009

2(1+2+3+...+2019)÷2020=2019

2[(2019×2020)÷2]÷2020=2019

2(2019×1010)÷2020=2019

(2×2.039.190)÷2020=2019

4.078.380÷2020=2019

Sper ca te-am ajutat!

Mult succes in continuare!