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aratati ca numarul:
N=2005+2×(1+2+3+...+2004)este patrat perfect,va rog ! dau coroana!


Răspuns :

[tex]N=2005+2(1+2+3+...+2004)\\ N=2005+2*\frac{2004*2005}{2}\\ N=2005+2004*2005\\ N=2005(1+2004)=\ \textgreater \ N=2005^2[/tex]