2*1 1/2*1 1/3*1 1/4*1 1/5*.1 1/2006*1 1/2007

2*1 1/2*1 1/3*1 1/4*1 1/5*.1 1/2006*1 1/2007 1/1*2+1/2*3+1/3*4+1/4*5+.+1/2006*2007 (1+1/2+1/3+...+1/2006)*(1/2+1/3+1/4+...1/2007)-(1+1/2+1/3+.. （1/2008-1)*(1/2007-1)*(1/2006-1)*...*(1/3-1)*(1/2-1) 1/2009-1/2008|+|1/2008-1/2007|+|1/2007-1/2006|+.+|1/3-1/2|+| |2009/1-2008/1|+|2008/1-2007/1|+|2007/1-2006/1|+.+|3/1-2/1|+ 数学计算题：计算(1-1/2)*(1-1/3)*(1-1/4)*.*(1-1/2006)*(1-1/2007) 计算题1-1/2-1/3+1/4+1/5-1/6-1/7+1/8+1/9……-1/2006-1/2007+1/2008+ 巧算：1×(1-1/2)×(1-1/3)×……×(1-1/2005)×(1-1/2006)×(1-1/2007)×(1- 巧算1/2*1/3+1/3*1/4+1/4*1/5+……+1/2006*1/2007+1/2007*1/2008 (-1*1/2)+(-1/2*1/3)+(-1/3*1/4)+(-1/4*1/5)+""+(-1/2005*1/2006 2007*(1-1/2)*(1-1/3)*(1-1/4).(1-1/2007)=?