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2014-10-22T10:19:59+03:00
1/2+1/2*3+1/2*5+...+1/2*2011= 1/2+3/2+5/2+...+2011/2 2011/2+2009/2+2007/2+...+1/2 -------------(tragi bara pe dedesubt) Rezultat:2012/2+2012/2+2012/2+...2012/2 -----------------------------------------2012:2=1006 termeni 2S=2012/2*1006 2S=1012036 S=1012036: 2 S=506018
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