1/3×5+1/5×7+1/7×9.+1/2011×2013
=1/2[(1/3-1/5)+(1/5-1/7)+(1/7-1/9)+……+(1/2011-1/2013)]
=1/2(1/3-1/2013)
=1/2*670/2013
=335/2013
1/3×5+1/5×7+1/7×9.+1/2011×2013
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