问题 解答题
解比例.
(1)
x
8
=
4.5
0.9

(2)2.7:x=54:18
(3)
1
20
1
3
=x:
5
9

(4)
1.25
2.25
=
x
1.6
答案

(1)

x
8
=
4.5
0.9

0.9x=4.5×0.8,

x=

4.5×0.8
0.9

x=4;

(2)2.7:x=54:18,

54x=2.7×18,

x=

2.7×18
54

x=0.9;

(3)

1
20
1
3
=x:
5
9

1
3
x=
1
20
×
5
9

1
3
x=
1
36

x=

1
36
÷
1
3

x=

1
12

(4)

1.25
2.25
=
x
1.6

2.25x=1.25×1.6,

x=

1.25×1.6
2.25

x=

8
9

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