17.89-8.6-7.89 80.43-2.75+13.57 3.54+0.76+1.46+2.24 9.16+2.54-9.16+9.46
17.89-8.6-7.89=17.89-7.89-9+0.4=10-9+0.4=1.4
80.43-2.75+13.57=80.43+13.57-3+0.25=94-3+0.25=91.25
3.54+0.76+1.46+2.24=(3.54+1.46)+(0.76+2.24)=5+3=8
9.16+2.54-9.16+9.46=(9.16-9.16)+(2.54+9.46)=0+12=12
80.43-2.75+13.57=80.43+13.57-3+0.25=94-3+0.25=91.25
3.54+0.76+1.46+2.24=(3.54+1.46)+(0.76+2.24)=5+3=8
9.16+2.54-9.16+9.46=(9.16-9.16)+(2.54+9.46)=0+12=12
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第1个回答 2020-04-08