1997 / 1998 + 998 / 999 + 665 / 666 - 332 / 333

1997 / 1998 + 998 / 999 + 665 / 666 - 332 / 333

(1997 / 1998 + 998 / 999) + (665 / 666 - 332 / 333)
= (1997 + 1996 / 1998) + (1995 - 1992 / 1998)
= 1997 + 1996 + 1995 - 1992 / 1998
= 3996 / 1998
= 2