题目内容

解比例.
0.72:x=9.6:4.8        12:
3
5
=x:0.5       
5
6
4
9
=
15
x
x:
1
4
=28:
1
6
(1)0.72:x=9.6:4.8,
            9.6x=0.72×4.8,
       9.6x÷9.6=3.456÷9.6,
               x=0.36;

(2)12:
3
5
=x:0.5,
       
3
5
x=12×0.5,
     
3
5
x÷
3
5
=6÷
3
5

          x=10;

(3)
5
6
4
9
=
15
x

       
5
6
x=
4
9
×
15,
    
5
6
x÷
5
6
=
20
3
÷
5
6

          x=8;

(4)x:
1
4
=28:
1
6

      
1
6
x=
1
4
×
28,
   
1
6
x÷
1
6
=7÷
1
6

         x=42.
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