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2
5
÷0.4=
1
1
       
2
3
÷
1
9
=
6
6
           
3
8
÷
9
16
=
2
3
           
0.52=
0.25
0.25
52=
25
25
            
3.14×5=
15.7
15.7
       
3.14×8=
25.12
25.12
      
4×3.14=
12.56
12.56
7×3.14=
21.98
21.98
    
9×3.14=
28.26
28.26
     
3.14×62=
113.04
113.04
    
3.14×102=
314
314
分析:根据分数除法和小数乘法的计算法则进行进行解答即可.
解答:
解:
2
5
÷0.4=1

2
3
÷
1
9
=6

3
8
÷
9
16
=
2
3
0.52=0.25 52=25 3.14×5=15.7
3.14×8=25.12 4×3.14=12.56 7×3.14=21.98
9×3.14=28.26 3.14×62=113.04 3.14×102=314.
故答案为:1,6,0.25,25,15.7,25.12,12.56,21.98,28.26,113.04,314.
点评:明确分数除法和小数乘法的计算法则,是解答此题的关键.
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