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42.1×0.75-0.579×25+57.9用简便算法怎么算
如题
人气:487 ℃ 时间:2020-05-25 03:31:18
解答
=42.1*0.75-57.9*0.25+57.9=42.1*0.75+57.9*(1-0.25)=42.1*0.75+57.9*0.75=100*0.75=75
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