问题 解答题
(1)x:9=8:3.(2)
2
3
5
6
=x:20
(3)
4
5
:2.4=x:0.06
(4)
6
7
2
3
=x:
7
15
(5)x:
3
20
=
1
4
3
8
(6)
x
4.5
=
4
27
答案

(1)x:9=8:3,

           3x=9×8,

        3x÷3=72÷3,

            x=24;

(2)

2
3
5
6
=x:20,

         

5
6
=
2
3
×
20,

     

5
6
x÷
5
6
=
40
3
÷
5
6

           x=16;

(3)

4
5
:2.4=x:0.06,

        2.4x=

4
5
×0.06,

   2.4x÷2.4=0.048÷2.4,

           x=0.02;

(4)

6
7
2
3
=x:
7
15

      

2
3
x=
6
7
×
7
15

   

2
3
x÷
2
3
=
2
5
÷
2
3

         x=

3
5

(5)x:

3
20
=
1
4
3
8

       

3
8
x=
3
20
×
1
4

    

3
8
x÷
3
8
=
3
80
÷
3
8

          x=

1
10

(6)

x
4.5
=
4
27

      27x=4.5×4,

  27x÷27=18÷27,

        x=

2
3

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