200002000× 1987减2000×19871987简便计算

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200002000×1987减2000×19871987简便计算200002000×1987减2000×19871987简便计算200002000×1987减2000×19871987简便计算2000

200002000× 1987减2000×19871987简便计算
200002000× 1987减2000×19871987简便计算

200002000× 1987减2000×19871987简便计算
200002000× 1987减2000×19871987
=2000×10001×1987-2000×1987×10001
=0