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1999×1999/2000 简便运算怎么算
人气:219 ℃ 时间:2020-04-07 04:47:07
解答
1999×1999/2000
=(2000-1)x1999/2000
=2000x1999/2000-1999/2000
=1999-1999/2000
=1998又1/2000
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