2.25+1.25*0.18=2.25+1.25*(0.2-0.02)=2.25+1.25*0.2-1.25*0.02=2.25+0.25-0.025=2.5-0.025=2.475
这道题直接计算就行,1.25×0.18=0.225,然后0.225再和2.25进行计算,当然1.25×0.18,也可以看成1.25×0.16+1.25×0.02=0.225