原式=(1/2)*(1/1-1/3+1/3-1/5+1/5-1/7+...+1/2005-1/2007+1/2007-1/2009)
=(1/2)*(1/1-1/2009)=1004/2009
计算:1/1×3+1/3×5+1/5×7+……+1/2005×2007+1/2007×2009
计算:1/1×3+1/3×5+1/5×7+……+1/2005×2007+1/2007×2009
数学人气:163 ℃时间:2019-08-20 22:15:56
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