根据最后一个式子,可以把前面的写成1/(3*4)+1/(4*5)+..........1/(2012*2013)
继续化简:可以写成(1/3-1/4)+(1/4+1/5)+...........(1/2011-1/2012)+(1/2012-1/2013)====1/3-1/2013
=1/3-1/2013
理由:1/12=1/3-1/4
1/20=1/4-1/5
1/30=1/5-1/6
.............
最后一项=1/2012-1/2013
所以相加一消就只剩下1/3-1/2013
等于1/3-1/4+1/4-1/5+·······+1/2012-1/2013=1/3-1/2013=2010/6039