求教4.25*166-42.5*14.2+24*5.75的简便算法
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![求教4.25*166-42.5*14.2+24*5.75的简便算法](/uploads/image/z/1339204-4-4.jpg?t=%E6%B1%82%E6%95%994.25%2A166-42.5%2A14.2%2B24%2A5.75%E7%9A%84%E7%AE%80%E4%BE%BF%E7%AE%97%E6%B3%95)
求教4.25*166-42.5*14.2+24*5.75的简便算法
求教4.25*166-42.5*14.2+24*5.75的简便算法
求教4.25*166-42.5*14.2+24*5.75的简便算法
4.25*166-42.5*14.2+24*5.75
=4.25*166-4.25*142+24*5.75
=4.25*(166-142)+24*5.75
=4.25*24+24*5.75
=24*(4.25+5.75)
=240
原式=4.25*166-4.25*142+24*5.75
=4.25*(166-142)+24*5.75
=4.25*24+24*5.75
=24*(4.25+5.75)
=24*10
=240
原式
=4.25*10*16.6-42.5*14.2+24*5.75
=42.5*16.6-42.5*14.2+24*5.75
=42.5*(16.6-14.2)+24*5.75
=42.5*2.4+24*5.75
=4.25*10*2.4+24*5.75
=24*(5.75+4.25)
=24*10
=240
=4.25*10*16.6-42.5*14.2+24*5.75
=42.5*16.6-42.5*14.2+24*5.75
=42.5*(16.6-14.2)+24*5.75
=42.5*2.4+24*5.75
=2.4*(57.5+42.5)
=2.4*100
=240
用计算器吧,那最简便~~
考试又可以用计算器。
原式=4.25*166-4.25*142+24*5.75=4.25*24+24*5.75=24*10=240