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1： 4 2 3 5 4 8 5 29
2： 0.64÷0.8÷0.5 0.64÷（0.8×0.5 ） =0.8÷0.5 =0.64÷0.4 =1.6 =1.6
4.5÷0.25÷0.4 4.5÷（0.25×0.4） =18÷0.4 =4.5÷0.1 =45 =45
0.54÷0.15÷0.4 0.54÷（0.15×0.4） =3.6÷0.4 =0.54÷0.06 =9 =9
8.1÷4.5÷0.2 8.1÷（4.5×0.2） =1.8÷0.2 =8.1÷0.9 =9 =9
3： 4.48÷2.8+1.5 =1.6+1.5 =3.1
（2.6+1.65÷0.15）×0.12 =（2.6+11）×0.12 =13.6×0.12 =1.632
35.4--9.6÷（2.65--1.05） =35.4--9.6÷1.6 =35.4--6 =29.4
6.3×[﹙0.9+1.8﹚÷4.5] =6.3×[2.7÷4.5] =6.3×0.6 =3.78
4： 500克=0.5千克 1.8÷0.5×5 =18 | 
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