am nevoie de ajutor urgent

Am Nevoie De Ajutor Urgent class=

Răspuns :

(1+2+3+.....+2010+2011)+(1+2+3+.....+2009+2010)

Cu suma lui Gauss

= (2011×2012/2 )+(2010×2011/2) =

==> 2011×1006 + 1005×2011 = Factori comun2011)

==> 2011×( 1006+1005 ) =

==> 2011× 2011 = 2011² patrat perfect !