42.1×0.75-0.579×25+57.9用简便算法怎么算如题

来源:学生作业帮助网 编辑:作业帮 时间:2024/05/07 01:37:25
42.1×0.75-0.579×25+57.9用简便算法怎么算如题

42.1×0.75-0.579×25+57.9用简便算法怎么算如题
42.1×0.75-0.579×25+57.9用简便算法怎么算
如题

42.1×0.75-0.579×25+57.9用简便算法怎么算如题
=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