(1/2+1/3+.1/2007)(1+1/2+1/3+.1/2006)-(1+1/2+1/3+.1/1/2007)(1
(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|+
(1+1/2+1/3+...+1/2006)*(1/2+1/3+1/4+...1/2007)-(1+1/2+1/3+..
2*1 1/2*1 1/3*1 1/4*1 1/5*.1 1/2006*1 1/2007
巧算:1×(1-1/2)×(1-1/3)×……×(1-1/2005)×(1-1/2006)×(1-1/2007)×(1-
1/1*2+1/2*3+1/3*4+1/4*5+.+1/2006*2007
数学计算题:计算(1-1/2)*(1-1/3)*(1-1/4)*.*(1-1/2006)*(1-1/2007)
(1/2008-1)(1/2007-1)(1/2006-1)…(1/3-1)(1/2-1)
2007*(1-1/2)*(1-1/3)*(1-1/4).(1-1/2007)=?
1*2/1+1/2*3+1/3*4...2004*2005/1+2005*2006/1+2006*2007/1
2009-2008+2007-2006+~+3-2+1