问题 解答题
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
答案

(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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