问题 解答题
8:30=24:x
2
3
5
6
=x:9
3:x=9:15
1.25:0.25=x:1.6
x
9
=
0.8
4.5
1
3
1
4
=
1
5
:x.
答案

(1)8:30=24:x

8x=30×24,

x=90;

(2)

2
3
5
6
=x:9

5
6
x=
2
3
×9,

x=

36
5

(3)3:x=9:15

9x=3×15,

x=5;

(4)1.25:0.25=x:1.6

0.25x=1.25×1.6,

x=8;

(5)

x
9
=
0.8
4.5

4.5x=9×0.8,

x=1.6;

(6)

1
3
1
4
=
1
5
:x

1
3
x=
1
4
×
1
5

x=

3
20

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