1/(1*2)+1/(2*3)+1/(3*4)+.1/(2007*2008)=
1-(1/2-1/3)-(1/3-1/4).-(1/2007-1/2008)=?
1/1*2+1/2*3+1/3*4+1/4*5.+1/2007*2008+1/2008*2009=?
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\(2\3)\(3\4)\.\(2007\2008)
|1-1/2|+|1/2-1/3|+|1/3-1/4|+……|1/2007-1/2008|=?
(-1)+2+(-3)+4+(-5)+.+(-2007)+2008
-1-2-3-4-5-...-2007-2008
初一数学计算题1/1*2+1/2*3+1/3*4+1/4*5+.+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|+
计算:|1/2-1|+|1/3-1/2|+|1/4-1/3|+...+|1/2008-1/2007|+|1/2009-1