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1999+199.9+19.99+1.999+2.111怎么算简便
人气:436 ℃ 时间:2019-11-13 00:55:18
解答
(2000-1)+(200-0.1)+(20-0.01)+(2-0.001)+(2+0.111)
=2000+200+20+2+2+0.111-0.1-0.01-0.001-1
=2224-1
=2223
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