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17.【解答】解: 0.64÷1.42.7+7.20=9.9
×0.72÷2.7
÷10.9﹣8.9=2
÷
×240
4.3+2.7200=7
18.【解答】解: 0.8÷10=0.8 25+8
=33
2379=226 6.08055
19.【解答】解:
.
1.6=0.4 0.5=0.7 0.9=0.8
1.5=0
0.3=0.81 0.3=8
×4
÷
×0.255
0.07=14.9=1.220.8=5 4
18787
÷0÷58=0
1000=0.10
×0.001×100=0.1
﹣257+
0=257 ×240
×
0.008=0
1000=6080.5=12
第 36 页 共 58 页
.
0.63÷5.4÷1.4509=0.07 ≈3.72 10.25=4 2.7
20.【解答】解: 8.44=2.1 1.18 2.9+3.7+2.1=8.7
21.【解答】解: 4.8
÷7.5
7.68+2.48=80
×0.41
÷3.60.2=18 ÷0.36
÷4×0.5=2 0.1
×3.5÷3.33
÷÷
4.65=0 0.7=5 0.05=2 0.1=3÷0.14÷9.6
÷
0.9=3 0.12=3 2=0.07 6=1.6
÷0.728
÷
90=0.00
×0.56+4.441.25×5×=5
8=50
×
0.8=0.8
×0.25=0.
﹣5.7+3.
3=9
1÷6.2÷﹣
0.8=6
.
0.45=7.0.25=0.62
第 37 页 共 58 页
.
05
0.75÷0.21.5=0.5 4=0.05
22.【解答】解: 0.72÷23.7+2.64.8
2
6.5
﹣1
÷80
0.42
23.【解答】解: 1.2÷200
.
4
4=0.84 60=7
2
1=9 0.8=9
÷0.21×1.2×5+3.2÷
÷0.55 ÷10
÷
0.9=0.8 3=26.33 0.4=12=0.2
÷
5.6=0.9 0.25=4
×0.48
0.8=14=2.5
÷
÷0.35×0.3
2
0.8=0.30.8=0.6 4=1.4 0.15=
÷4÷0.72÷4=0.18 ﹣0.24÷
0.4=3 8=0.25 0.5=8
÷3.6+1.81
.27
5.32==5.4
0.73=00.6=0.4
第 38 页 共 58 页
.
6.4÷0.125×0.5
4
24.【解答】解: 2.5÷0.42÷3.5
50
0.25×12.5×0.24=1
25.【解答】解: 0.56÷0.6+0.60.7=0.8 5=1.25 5.20
26.【解答】解: 3.6
÷8.1
÷4.8
÷99.99
×13.2÷0.6=22
1.6=4 80=10 0.8=0.
÷0.54÷0.8
45
×0
÷0.36
﹣
0.5=5 0.6=0.7 0.01=30.6=0.9 0.35=0.
×
0.8=10 50=10 3.68=0 0.2=0.0
3.9÷1.3=3 12
0.03=400
÷
×13.5﹣2.825×0.32×
0.13=41.01=99﹣7.2=3.5 125=1000
÷1.25×8=10
1.2=3 9=0.9
.
0.6=8
第 39 页 共 58 页
.
990
÷2500
÷88000
÷14
÷
0.9=110.05=50.008=112.5=0.
27.【解答】解: 0.64÷0.7
4
2.9
÷0.38
28.【解答】解:0.02×0.1=0.002 12﹣4.3=7.7 36÷0.01=3600 0.8×0.125=0.1 2.3+0.8=3.1 0.36÷0.4÷9=0.1
29.【解答】解:3.6÷1.2=3 4.4÷4=1.1 4.8÷0.4=12
.
×7.2÷(0.8×40
0
×0.07
×0÷
0.32=2 1.2=0.89)=1 0.25=14.8=0 ×100×22.1×0.07=7 1=22.1
2.9=1 0.6=0.150=3.5
第 40 页 共 58 页