问题 解答题
x-
1
5
x=
3
10
2
9
=
6
7
x+
1
6
x=
7
6
答案

①x-

1
5
x=
3
10

4
5
x=
3
10

4
5
5
4
=
3
10
×
5
4

x=

3
8

②x÷

2
9
=
6
7

9
2
=
6
7

9
2
×
2
9
=
6
7
×
2
9

x=

4
21

③x+

1
6
x=
7
6

7
6
x=
7
6

7
6
6
7
=
7
6
×
6
7

x=1.

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