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2000/2001*1999=
人气:376 ℃ 时间:2020-04-03 03:31:36
解答
2000/2001x1999
=2000/2001x(2001-2)
=2000/2001x2001-4000/2001
=2000-4000/2001
=1998又 1999/2001
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