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Calculați:
A) (1+2+3+.....+2018):2019
B) 2×(1+2+3+.....2019) :2020​


Răspuns :

Explicație pas cu pas:

A)2018×2019:2:2019=1009

B)2×2019×2020:2:2020=2019

Răspuns:

A) (1+2+3+.....+2018):2019=[2018·(2018+1)]/2:2019=2037171:2019=1009

B) 2×(1+2+3+.....2019) :2020​=2·[2019·(2019+1)]/2:2020=4078380:2020=2019