计算1/1X3+1/3x5十1/5X7+.+1/2009x2011

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计算1/1X3+1/3x5十1/5X7+.+1/2009x2011计算1/1X3+1/3x5十1/5X7+.+1/2009x2011计算1/1X3+1/3x5十1/5X7+.+1/2009x2011=

计算1/1X3+1/3x5十1/5X7+.+1/2009x2011
计算1/1X3+1/3x5十1/5X7+.+1/2009x2011

计算1/1X3+1/3x5十1/5X7+.+1/2009x2011
=1/2×(1-1/2011)
=1/2×2010/2011
=1005/2011