(2013/1-1)(2012/1-1)(2011/1-1).(3/1-1)(2/1-1)
(2013/1-1)(2012/1-1)(2011/1-1).(3/1-1)(2/1-1)
|1/2013-1/2012|+ |1/2012-1/2011|+|1/2011-1/2010|-|1/2010-1/2
|1/2-1|+|1/3-1/2|+|1/4-1/3|+...+|1/2012-1/2011|+|1/2013-1/20
1/1*2+1/2*3+1/3*4.+1/2011*2012+1/2012*2013
1/1×2+1/2×3+1/3×4+…+1/2010×2011+1/2012×2013
(1/2012-1)(1/2011-1)(1/2010-1)...(1/3-1)(1/2-1)咋算
(1\2012-1)(1\2011-1)(1\2010-1)...(1\3-1)(1\2-1)=?
计算:1/(1*3)+1/(2*4)+1/(3*5)+...+1/(2011*2013)+1/(2012 *2014)
|1/2014-1/2013|+|1/2013-1/2012|+|1/2012+1/2011|-|1/2011-1/20
(-1*2/1)+(-1/2*1/3)+(-1/3*1/4)+…+(-1/2012*1/2013)
计算:(1/2-1)(1/3-1)(1/4-1)...(1/2010-1)(1/2011-1)(1/2012-1)
(-1*1/2)+(-1/2*1/3)+(-1/3*1/4)+.+(-1/2011*1/2012)