1楼二尔
(祝福)
发表于 2008-11-13 23:32
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分子=（1+1/2+1/3+1/4...+1/2008)-2*(1+1/2+1/3+1/4.....1/1004)
=1/1005+1/1006+1/1007....1/2008
分母=1/2010+1/2012+1/2014....1/4016
=1/2*(1/1005+1/1006+1/1007....+1/2008)
原式=（1/1005+1/1006+1/1007....1/2008）/{1/2*(1/1005+1/1006...1/2008)}
=2.
