2008+2007-2006-2005+2004+2003-2002-2001+2000+1999-1998-1997+
2008+2007-2006-2005+2004+2003-2002-2001+2000+1999-1998-1997+
2008+2007+2006-2005-2004-2003+2002+2001+2000-1999-1998-1997+
1997/1998+1999/2000+2001/2002+2003/2004+2005/2006
2005*1997+2004*1998+2003*1999+2002*2000+2001*2001
若1999分之1997+1998+1999+2000+2001=N分之2002+2003+2004+2005+2006,
计算:1998+2000+2002+2004+2006分之1997+1999+2001+2003+2005
1999+2000-2001+2002-2003+2004-2005+2006-2007
1999,2000,2001,2002,2003,2004,2005,2006,2007,2008,2009,2010,
2010+2009+2008+2007-2006-2005-2004-2003+2002+2001+2000+1999-
2000-2001+2002-2003+2004-2005+2006-2007+2008=?
2000-2001+2002-2003+2004-2005+2006-2007+2008
2005+2004-2003+2002+2001-2000+1999+1998-1997+.+1006+1005-100