(1/2+1/3+1/4+...+1/1997)(1+1/2+1/3+...+1/1996)-(1+1/2+1/3+1/
(1/2+1/3+……+1/1997)(1+1/2+……+1/1996)-(1+1/2+……+1/1997)(1/2+1
1.(1-1/2-1/3-...-1/1996)x(1/2+1/3+1/4+...+1/1997)-(1-1/2-1/3
一道初一数学题(2/1+3/1+……+1997/1)x(1+2/1+3/1+……+1996/1)速度 今天就要
200*(1-1/2)*(1-1/3)*(1-1/4)*.*(1-1/100)
计算 ( 1+1/2)*(1-1/3)*(1+1/4)*(1-1/5)*.*(1+1/1000)*(1-1/1001)
一道奥数题,急救!(1+1/2+1/3+1/4)×(1/2+1/3+1/4+1/5)-(1+1/2+1/3+1/4+1/
(1) 1,1/3,1/5,1/7,1/9 (2)- 1/2*1,1/2*2,- 1/2*3,1/2*4,-1/2*5
(1+1/2)*(1+1/4)*(1+1/6)*...*(1+1/2008)*(1-1/3)*(1-1/5)*(1-1/
1/1×2+1/1-1/2:;1/2×4=1/2×(1/2-1/4);1/58×=1/3(×1/5-1/8)
1 1 1 1 1(1- -)(1- -)(1- -)...(1- - )(1- - )=?2 3 4 2007 200
计算:(1/2+1/3+1/4+…+1//2006)(1+1/2+1/3+…+1/2005)-(1+1/2+1/3+1/
(1-1/2-1/3-1/4-……-1/2003)(1/2+1/3+1/4+...+1/2004)-(1-1/2-1/3