1/2001*2002+1/2002*2003+1/2003*2004+1/2004+2005+1/2005
1/2001*2002+1/2002*2003+1/2003*2004+1/2004*2005+1/2005=?/?
1/2001*2002+1/2002*2003+1/2003*2004+1/2004+2005+1/2005
2001/2002+2002/2003+2003/2004+2004/2005+1/2005=?
2005-2004+2003-2002+2001……+3-2+1
计算:2005×2004-2004×2003+2003×2002-2002×2001+…+3×2-2×1=______.
,2001×2002分之1+2002×2003分之1+2003+2004分之1+2004×2005分之1+2005分之1
求1/(1/2001+1/2002+1/2003+1/2004+1/2005+1/2006+1/2007+1/2008+
求1除以(1/2001+1/2002+1/2003+1/2004+1/2005+1/2006+1/2007+1/2008
2003+2002*2004分之2003*2004-1
|1/2004-1/2003|+|1/2003-1/2002|+|1/2002-1/2001|+|1/2001-1/20
化简:|1/2004-1/2003|+|1/2003-1/2002|+|1/2002-1/2001|-|1/2001-1
2002/2002又2002/2003+1/2004