Răspunsuri

2014-10-15T10:54:54+03:00
     7+9+11+13+....+2011+2013
-5- 7-9-11-13-.......-2011
-----------------------------------------
-5..................................+2013 = 2008

pt ca +7-7=0
9-9=0.....2011-2011 = 0 si nu mai are rost sa scriem. ramane doar -5+2013
2014-10-15T11:10:14+03:00
7+9+11+......+2013 - 5-7-9-.........-2011 = (7-7) +(9-9) +(11-11) +..... +(2011-2011) + 2013 - 5 = 2008