题目内容

把下列各比写成分数形式
9:8=
 
           
5
8
:0.75
=
 
              
3
8
2
9
=
 
12:0.8=
 
      
3
8
:1.5
=
 
              
9
111
:1
=
 
1
5
5
8
=
 
     
0.45:
3
4
=
 
             
1.5:1.2=
 
50:0.5=
 
            
4:20=
 
             
7:0.01=
 
分析:根据比与分数的关系,比的前项相当于分数的分子,比号相当于分数线,比的后项相当于分数的分数的分母,化成分数后再根据分数的基本性质,把分数化简即可.
解答:解:9:8=
8
9

5
8
:0.75=0.625:0.75=
625
750
=
5
6

3
8
2
9
=
3
8
÷
2
9
=
3
8
×
9
2
=
27
16

12:0.8=
12
0.8
=
120
8
=
15
1

3
8
:1.5=0.375:1.5=
0.375
1.5
=
375
1500
=
1
4

9
111
:1=
9
111
÷1=
9
111

1
5
5
8
=
1
5
÷
5
8
=
1
5
×
8
5
=
8
25

0.45:
3
4
=0.45:0.75=
0.45
0.75
=
45
75
=
3
5

1.5:1.2=
1.5
1.2
=
15
12
=
5
4

50:0.5=
50
0.5
=
500
5
=
100
1

4:20=
4
20
=
1
5

7:0.01=
7
0.01
=
700
1

故答案为:
8
9
5
6
27
16
15
1
1
4
9
111
8
25
3
5
5
4
100
1
1
5
700
1
点评:本题主要是考查比与分数之间的关系,属于基础知识,要掌握.
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