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Aratati ca numarul 2*(1+2+3+...+2009)+2010 e patrat perfect.

Răspuns :

2x 2009x2010:2 +2010  = 2009x2010 +2010  = 2010( 2009 +1) = 2010.x2010 = 2010la puterea a 2 . deci pp