(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|+
(1/2008-1)*(1/2007-1)*(1/2006-1)*...*(1/3-1)*(1/2-1)
(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|-|1/2006-1/20
|1/2008-1/2007|+丨1/2007-1/2006|-|1/2008-1/2006| 还有第二题1/1×3+1
|1/2008-1/2007|+|1/2007-1/2006|+|1/2006-1/2005|+|1/2005-1/20
1.(1-1/2008)(1-1/2007)(1-1/2006)...(1-1/2001)(1-1/1000)
2009-2008+2007-2006+~+3-2+1
2008+2007+2006…+3+2+1
计算 |1\2008-1\2007| +|1\2007-1\2006|+|1\2006-1\2005|+|1\2005-
2*1 1/2*1 1/3*1 1/4*1 1/5*.1 1/2006*1 1/2007