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5.48-(1.4-0.52)怎么简便计算
人气:454 ℃ 时间:2020-04-25 07:40:56
解答
5.48-(1.4-0.52)
=5.48-1.4+0.52
=5.48+0.52-1.4
=6-1.4
=4.6
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