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
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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