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46.7-38.2+33.3-1.8怎样简便计算?
人气:492 ℃ 时间:2020-04-09 13:35:13
解答
46.7-38.2+33.3-1.8
=46.7+33.3-38.2-1.8
=(46.7+33.3)-(38.2+1.8)
=80-40
=40
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