(1/2013-1)（1/2012-1)(1/2011-1)…（1/3-1)(1/2-1）=

(2013/1-1)(2012/1-1)(2011/1-1).(3/1-1)(2/1-1) 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)=? (-1*2/1)+(-1/2*1/3)+(-1/3*1/4)+…+(-1/2012*1/2013) |1/2013-1/2012|+ |1/2012-1/2011|+|1/2011-1/2010|-|1/2010-1/2 (-1×1/2)+(-1/2×1/3)+(1/3×1/4)+…+(-1/2011×1/2012)+(-1/2012×1/ 2013×(1/1×2+1/2×3+1/3×4+……1/+2011×2012+2012×2013)怎么算? |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 (1/2013×1/2012×1/2011×…×1/2×1)∧2014×(2013×2012×2011×…×2×1)∧2 根据（1）式结果计算：1/1×2+1/2×3+1/3×4+…+1/2012×2013=? (1／2014－1)×(1／2013－1)×(1／2012－1)…（1/3-1)(1/2-1)