51.8-4.8×(2.03-0.18)=51.8-4.8*1.85=51.8-(5-0.2)*1.85=51.8-9.25+0.37=42.97
=4.8*11-1-4.8*(2.03-0.18)=4.8*(11-2.03+0.18)-1=4.8*9.15-1=42.92
您多打了？
