|1/2-1|+|1/3-1/2|.|1/2012-1/2011|=?

(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= (1/2012-1)(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*1/2)+(-1/2*1/3)+(-1/3*1/4)+.+(-1/2011*1/2012) (-1×1/2)+(-1/2×1/3)+(1/3×1/4)+…+(-1/2011×1/2012)+(-1/2012×1/ 1/1*2+1/2*3+1/3*4.+1/2011*2012+1/2012*2013 计算:(1/2-1)(1/3-1)(1/4-1)...(1/2010-1)(1/2011-1)(1/2012-1) |1/2-1|+|1/3-1/2|+|1/4-1/3|+...+|1/2012-1/2011|+|1/2013-1/20 |1/2013-1/2012|+ |1/2012-1/2011|+|1/2011-1/2010|-|1/2010-1/2 1/1×2+1/2×3+1/3×4+…+1/2010×2011+1/2012×2013 1/1*2+1/2*3+1/3*4...+1/99*100+1/(2011*2012)