简便计算过程方法如下解:75×124-75×24=75×(124-24)=75×100=7500
75×124-75×24=75×（124-24）=75×100=7500
75×124-75×24 =75×（124-24） =75×100 =7500
=75×（124-24）=75×100=7500
=75x（124-24）=75x100=7500
