题目内容

解比例
(1)
12.5
2.5
=
x
8

(2)
3
4
9
10
=x:
3
5

(3)
22.4
x
=
2
3

(4)
6
x
=
10
7
(1)
12.5
2.5
=
x
8

2.5x=12.5×8,
2.5x÷2.5=100÷2.5,
x=40;

(2)
3
4
9
10
=x:
3
5

9
10
x=
3
4
×
3
5

9
10
9
10
=
9
20
÷
9
10

x=
1
2


(3)
22.4
x
=
2
3

2x=22.4×3,
2x÷2=67.2÷2,
x=33.6;

(4)
6
x
=
10
7

10x=6×7,
10x÷10=42÷10,
x=4.2.
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