2003+2002+2001-2000-1999-1998+1997+1996+1995-1994-1993-1992+
1991+1992+1993+1994+1995+1996+1997+1998+1999+2000+2001+2002=
2003+1991-1992+1993-1994+1995-1996+1997-1998+1999-2000+2001-
2003+2002+2001-2000-1999-1998+1997+1996+1995-1994-1993-1992.
1991+1992+1993+1994+1995+1996+1997+1998+1999+2000+2001+2001
2000+1999-1998-1997+1996+1995-1994-1993+1992+1991
2001-2000-1999+1998+1997-1996+1995-1994-1993+1992+1991-1990+
1994+1996+1998+2000+2002+2004+2006分之1993+1995+1997+1999+2001
1994+1996+1998+2000+2002+2004+2006/1995+1997+1999+2001+2003+
2003-2002+2001-2000+1999-1998+1997-1996+1995-1994+.+3-2+1=?
2001-2000-1999+1998+1997-1996+1995-1994-1993+1992+1991-1990+
1999+1998-1997-1996+1995+1994-1993-1992+.-1
试说明1991^1992+1993^1994+1995^1996+1997^1998+1999^2000能被5整除