(-1*1/2)+(-1/2*1/3)+(-1/3*1/4)+...+(-1/2007*1/2008)
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-(1/2-1/3)-(1/3-1/4).-(1/2007-1/2008)=?
计算:|1/2-1|+|1/3-1/2|+|1/4-1/3|+...+|1/2008-1/2007|+|1/2009-1
(1/2008-1)*(1/2007-1)*(1/2006-1)*...*(1/3-1)*(1/2-1)
1\(2\3)\(3\4)\.\(2007\2008)
1/1*2+1/2*3+1/3*4+1/4*5.+1/2007*2008+1/2008*2009=?
"1*2/1+2*3/1+3*4/1+.+2007*2008/1+2008*2009/1+2009*2010/1"这道题
1/(1*2)+1/(2*3)+1/(3*4)+.1/(2007*2008)=?
1/(1*2)+1/(2*3)+1/(3*4)+.1/(2007*2008)=
计算1\1*2+1\2*3+1\3*4+.+1\2007*2008
|1-1/2|+|1/2-1/3|+|1/3-1/4|+……|1/2007-1/2008|=?