问题 解答题
解方程.
2
7
x=
8
21
6
35
=
26
45
÷
13
25
2
3
1
4
=12
答案

(1)

2
7
x=
8
21

2
7
2
7
=
8
21
÷
2
7

x=

8
21
×
7
2

x=

4
3

(2)x÷

6
35
=
26
45
÷
13
25

6
35
×
6
35
=
26
45
×
25
13
×
6
35

x=

4
21

(3)

2
3
1
4
=12,

2
3
1
4
×4=12×4,

2
3
x=48,

2
3
2
3
=48÷
2
3

x=48×

3
2

x=72.

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