问题 解答题
解比例.
0.7
x
=
14
5
         ②0.75:
1
2
=12:x         ③
2
15
1
6
=x:
2
3

④4:4.5=
x
27
         ⑤
2
3
5
6
=x:9             ⑥6.5:x=3.25:4.
答案

0.7
x
=
14
5

       14x=0.7×5,

   14x÷14=3.5÷4,

         x=0.25;

②0.75:

1
2
=12:x,

      0.75x=

1
2
×12,

0.75x÷0.75=6÷0.75,

          x=8;

2
15
1
6
=x:
2
3

     

1
6
x=
2
15
×
2
3

 

1
6
x÷
1
6
=
4
45
÷
1
6

      x=

8
15

④4:4.5=

x
27

 4.5×

x
27
=4,

  

1
6
x÷
1
6
=4÷
1
6

       x=24;

2
3
5
6
=x:9,

    

5
6
x=
2
3
×9,

 

5
6
x÷
5
6
=6÷
5
6

      x=

36
5

⑥6.5:x=3.25:4.

      3.25x=6.5×4,

3.25x÷3.25=26÷3.25,

          x=8.

单项选择题
单项选择题