1/2+1/2×3+1/3×4+……+1/2012×2013
(-1*2/1)+(-1/2*1/3)+(-1/3*1/4)+…+(-1/2012*1/2013)
2013×(1/1×2+1/2×3+1/3×4+……1/+2011×2012+2012×2013)怎么算?
1/1×2+1/2×3+1/3×4+…+1/2010×2011+1/2012×2013
1/2十1/(2+3)十1/(3+4)十1/(4+5)十……1/(2012+2013)
1/2013+2/2013+3/2013+4/2013+…+2011/2013+2012/2013
(1/2+2/3+3/4+……+2013/2014)·(1+1/2+2/3+……+2012/2013)-(1
(-1×1/2)+(-1/2×1/3)+(-1/3×1/4)+…+(-1/2012×1/2013) 求大神指导~
1×2+2×3+3×4+4×5+……+2012×2013
1×2×3×……×2012×2013怎么算
1/(1-1/2)/(1-1/3)/(1-1/4)/……/(1-1/2012)
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
根据(1)式结果计算:1/1×2+1/2×3+1/3×4+…+1/2012×2013=?