(-1*2/1)+(-1/2*1/3)+(-1/3*1/4)+…+(-1/2012*1/2013)
(-1*2/1)+(-1/2*1/3)+(-1/3*1/4)+…+(-1/2012*1/2013)
1/1×2+1/2×3+1/3×4+…+1/2010×2011+1/2012×2013
(-1×1/2)+(-1/2×1/3)+(-1/3×1/4)+…+(-1/2012×1/2013) 求大神指导~
1/(1-1/2)/(1-1/3)/(1-1/4)/……/(1-1/2012)
2013×(1/1×2+1/2×3+1/3×4+……1/+2011×2012+2012×2013)怎么算?
1/2+1/2×1+1/3×1+1/4×3+.+1/2013×2012
(-1×1/2)+(-1/2×1/3)+(1/3×1/4)+…+(-1/2011×1/2012)+(-1/2012×1/
|1/2-1|+|1/3-1/2|+|1/4-1/3|+...+|1/2012-1/2011|+|1/2013-1/20
数学课上老师出了一道题,计算(1/2+1/3+1/4+…+1/2013)×(1+1/2+1/3…1/2012)-(1+1
(1/2014-1)×(1/2013-1)×(1/2012-1)…(1/3-1)(1/2-1)
(2013/1-1)(2012/1-1)(2011/1-1).(3/1-1)(2/1-1)
根据(1)式结果计算:1/1×2+1/2×3+1/3×4+…+1/2012×2013=?