(2006/1-1)(2005/1-1)(2004/1-1)----(1001/1-1)(1000/1-1)
(1/2004 -1)(1/2003 -1)(1/2002 -1).(1/1001 -1)(1/1000 -1)
1/2003+1/2004+1/2005+1/2006+1/2007?
计算:(1/2006-1)(1/2005-1)(1/2004)… (1/3-1)(1/2-1).
2005+2006*2004分之2005*2006-1
1.计算(1/2006-1)(1/2005-1)(1/2004-1)…(1/2-1) ( / 分数线)
计算:(2+1/2003+1/2004=1/2005+1/2006)+(1/2003+1/2004+1/2005+1/2
1/2004*2005+1/2005*2006+1/2006*2007+1/2007*2008+1/2008用简便
1/1*2+1/3*4+1/4*5+...+1/2004*2005+1/2005*2006,
1/1*2+1/2*3+1/3*4+.+1/2004*2005+1/2005*2006
写过程(1/2004-1) (1/2003-1) (1/2002-1)...(1/1001-1) (1/1000-1)=
2006*2005分之2004+2005分之1
(1-1/2008)*(1-1/2007)*(1-1/2006).*(1-1/1001)*(1-1/1000)帮忙写出运