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Arata ca numarul a=2018^1+2*(1+2+3+....+2017)este patrat perfect.

Răspuns :

Răspuns:

a = 2018 + 2*[(2017*2018)/2]

a= 2018 + 2017*2018

a= 2018*(1+2017)

a= 2018*2018

a= 2018²