问题 解答题
解比例.
0.5:x=
2
3
:0.25
x
25
=
1.2
75
3
5
7
12
=
9
10
:x
15:x=0.2:44.
答案

(1)0.5:x=

2
3
:0.25,

2
3
x=0.25×0.5,

2
3
x=1.25,

x=1.25÷

2
3

x=1.875,

x
25
=
1.2
75

75x=25×1.2,

x=

25×1.2
75

x=0.4,

3
5
7
12
=
9
10
:x,

3
5
x=
7
12
×
9
10

3
5
x=
21
40

x=

21
40
÷
3
5

x=

7
8

15:x=0.2:44,

0.2x=15×44,

x=

15×44
0.2

x=3300.

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