(1-2012/1)(1-2011/1)(1-2010/1) ...(1-3/1)(1-2/1)

(1/2012-1)(1/2011-1)(1/2010-1)...(1/3-1)(1/2-1)咋算 (1\2012-1)(1\2011-1)(1\2010-1)...(1\3-1)(1\2-1)=? 计算:(1/2-1)(1/3-1)(1/4-1)...(1/2010-1)(1/2011-1)(1/2012-1) |1/2013-1/2012|+ |1/2012-1/2011|+|1/2011-1/2010|-|1/2010-1/2 (2012分之1-1)(2011分之1-1)(2010分之1-1) ...(3分之1-1) (2分之1-1) (2013/1-1)(2012/1-1)(2011/1-1).(3/1-1)(2/1-1) (2011/1-1)(2010/1-1)(2009/1-1)…(3/1-1)(2/1-1) 1/1×2+1/2×3+1/3×4+…+1/2010×2011+1/2012×2013 (1+1/2+1/3+.+1/2010)×(1/2+1/3+.+1/2011)-(1+1/2+1/3+.+1/2011) |1/2011-1/2010|+|1/2011-1/2009|+|1/2009-1/2008|+...+|1/3-1/2 (-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/