2007*(1-1/2)*(1-1/3)*(1-1/4).(1-1/2007)=?
2007*(1-1/2)*(1-1/3)*(1-1/4).(1-1/2007)=?
1-(1/2-1/3)-(1/3-1/4).-(1/2007-1/2008)=?
1 1 1 1 1(1- -)(1- -)(1- -)...(1- - )(1- - )=?2 3 4 2007 200
2*1 1/2*1 1/3*1 1/4*1 1/5*.1 1/2006*1 1/2007
(1+1/2+1/3+...+1/2006)*(1/2+1/3+1/4+...1/2007)-(1+1/2+1/3+..
|1-1/2|+|1/2-1/3|+|1/3-1/4|+……|1/2007-1/2008|=?
1/(1*2)+1/(2*3)+1/(3*4)+.1/(2007*2008)=?
1/(1*2)+1/(2*3)+1/(3*4)+.1/(2007*2008)=
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+1/2*3+1/3*4+1/4*5.+1/2007*2008+1/2008*2009=?
计算:|1/2-1|+|1/3-1/2|+|1/4-1/3|+...+|1/2008-1/2007|+|1/2009-1