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2014-05-10T11:23:09+03:00
1) (-1) +(-1) +(-1).....+(-1) de 11 ori    = (-1) *11= -11 

2)(1-2-3+4)+(5-6-7+8)+(9-10-11+12)+....+(61-62-63+64)
(5-5)+(13-13)+(21-21)+.....(125-125)
0+0+0...+0=0
3 5 3