题目内容

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
(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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