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1997×19981998-199719971997×1998
人气:369 ℃ 时间:2020-04-07 16:54:37
解答
1997×199819981998-199719971997×1998
=1997×1998×100010001-100010001×1997×1998
=1997×1998×(100010001-100010001)
=0
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