Răspunsuri

2014-04-14T16:49:20+03:00
S=-1-1-1-.......-1  dee 2012 ori deci
S=(-1)*2012=-2012
Cel mai inteligent răspuns!
2014-04-14T17:01:05+03:00
S=(+1-2)+(+3-4)+............+(2011-2012)=-1x1006=-1006