简便计算:778×999 666×333.
=778×999 222×3×333,
=778×999 222×999,
=(778 222)×999,
=1000×999,
=999000.
778×999 666×333, =778×999 222×3×333, =778×999 222×999, =(778 222)×999, =1000×999, =999000....
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