解:依据题意有,2.64+x=9.23,解之得: x=6.59验算: 9.23-6.59=2.640.6x=42.12, 解之得: x=42.12/0.6=70.2验算: 0.6*70.2=0.6*(70+0.2)=42+0.12=42.12