一、口算。
$10÷0.025=$
$0.36÷0.9=$
$77÷7.7=$
$0.84÷0.21=$
$0.72÷12=$
$50÷0.4=$
$4.8÷0.08=$
$0.6÷1.2=$
$9.6÷4=$
$12÷2.4=$
$0.56÷0.2=$
$0.36÷1.8=$
$90÷0.18=$
$0.9÷0.06=$
$0.76÷4=$
$5.7÷3=$
$6.3÷0.9=$
$6.9÷0.23=$
$0.99÷3.3=$
$2.01÷3=$
$0.3÷1.5=$
$6.4÷0.4=$
$3.2÷16=$
$9.3÷0.3=$
$9÷0.2=$
$0.8÷0.05=$
$1.22÷2=$
$0.39÷13=$
$50÷2.5=$
$6.4÷0.16=$

1.400
2.0.4
3.10
4.4
5.0.06
6.125
7.60
8.0.5
9.2.4
10.5
11.2.8
12.0.2
13.500
14.15
15.0.19
16.1.9
17.7
18.30
19.0.3
20.0.67
21.0.2
22.16
23.0.2
24.31
25.45
26.16
27.0.61
28.0.03
29.20
30.40

二、用“四舍五入”法求出商的近似值。

1. 36.9 36.86 36.857
2. 12.9 12.87 12.870
3. 3.1 3.10 3.103
4. 0.3 0.29 0.289
5. 18.0 17.96 17.965