|1-1/2|+|1/2-1/3|+|1/3-1/4|+……|1/2007-1/2008|=?
|1-1/2|+|1/2-1/3|+|1/3-1/4|+……|1/2007-1/2008|=?
(1-1/2^)(1-1/3^)……(1-1/2007^)(1-1/2008^)
找规律计算:(-1×1/2)+(-1/2×1/3)+(-1/3×1/4)+…+(-1/2007×1/2008)
2008-2007+2006-2005+…+4-3+2-1=
巧算1/2*1/3+1/3*1/4+1/4*1/5+……+1/2006*1/2007+1/2007*1/2008
设M=1/(1+根号2)+1/(根号2+根号3)+……+1/(根号2007+根号2008),N=1-2+3-4+……+2
计算题1-1/2-1/3+1/4+1/5-1/6-1/7+1/8+1/9……-1/2006-1/2007+1/2008+
2008+2007+2006…+3+2+1
1+1/2+1/3+1/4+……+1/2004+1/2005+1/2006+1/2007+1/2008+1/2009+1
(1/2008-1)(1/2007-1)(1/2006-1)…(1/3-1)(1/2-1)
1-(1/2-1/3)-(1/3-1/4).-(1/2007-1/2008)=?
1+2+3+4+…+2008+2007+…+4+3+2+1