1/1x3+1/3x5+1/5x7+…+1/2011x2013是多少?
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1/1x3+1/3x5+1/5x7+…+1/2011x2013是多少?1/1x3+1/3x5+1/5x7+…+1/2011x2013是多少?1/1x3+1/3x5+1/5x7+…+1/2011x201
1/1x3+1/3x5+1/5x7+…+1/2011x2013是多少?
1/1x3+1/3x5+1/5x7+…+1/2011x2013是多少?
1/1x3+1/3x5+1/5x7+…+1/2011x2013是多少?
=(1-1/3+1/3-1/5+1/5……+1/2011-1/2013)=(1-2013)除以2/2013=2012/2013
=(1-1/3+1/3-1/5+1/5……+1/2011-1/2013)=(1-2013)除以2/2013=2012/2013