求教4.25*166-42.5*14.2+24*5.75的简便算法

问题描述:

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