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