计算:l1/3-1l+l1/5-1/3l+l1/7-1/5l+.+l1/2011-1/2009l

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计算:l1/3-1l+l1/5-1/3l+l1/7-1/5l+.+l1/2011-1/2009l

计算:l1/3-1l+l1/5-1/3l+l1/7-1/5l+.+l1/2011-1/2009l
计算:l1/3-1l+l1/5-1/3l+l1/7-1/5l+.+l1/2011-1/2009l

计算:l1/3-1l+l1/5-1/3l+l1/7-1/5l+.+l1/2011-1/2009l
l1/3-1l+l1/5-1/3l+l1/7-1/5l+.+l1/2011-1/2009l
=1-1/3+1/3-1/5+1/5-1/7+……+1/2009-1/2011
=1-1/2011
=2010/2011