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cum pot rezolva 1+2+3+4+5+...+2013

Răspuns :

1+2+3+4+5+.....+2013=
=[2013•(2013+1)]:2=
=(2013•2014):2=
=4.054.182:2=
=2.027.091
• = ori ( inmultit => × )
1+2+3+4+5+...+2013 =2013×2014/2=2013×1007=2027091