简便计算9.6-0.75-2.18=9.6-(0.75+2.18)=9.6-2.93=9.6-3+0.07=6.6+0.07=6.67
9.6-0.75-2.18=9.6-(0.75+2.18)=9.6-2.93=9.6-3+0.07=6.6+0.07=6.67
那就是=9.6-(2.18+0.75)=9.6-2.93=6.67