1998×(111−12009)+11×(11998−12009)−2009×(111+11998)+3=______ .
1998 × (111 − 12009) + 11 × (11998 − 12009) − 2009 × (111 + 11998) + 3, = 3 - (2009-1998) × 111 - (1998 + 11) × 12009 - (2009-11) × 11998, = 3-11 × 111-2009 × 12009-1998 × 11998, = 3-1-1-1, = 0
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