1989×1999-1988×2000.
人气:482 ℃ 时间:2020-03-26 13:04:08
解答
1989×1999-1988×2000
=1989×(2000-1)-1988×2000,
=1989×2000-1989×1-1988×2000,
=(1989-1988)×2000-1989,
=1×2000-1989,
=2000-1989,
=11.
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