问题 解答题
17
40
÷x=
7
20
6x×
3
4
=
3
10
8
9
=
7
8
答案

(1)

17
40
÷x=
7
20

17
40
÷x×x=
7
20
x

7
20
x=
7
40

7
20
7
20
=
17
40
÷
7
20

x=

17
40
×
7
20

x=

17
14

(2)6x×

3
4
=
3
10

6x×

3
4
÷
3
4
=
3
10
÷
3
4

6x=

2
5

6x÷6=

2
5
÷6

x=

1
15

(3)x÷

8
9
=
7
8

8
9
×
8
9
=
7
8
×
8
9

x=

7
9

故答案为:

17
14
1
15
7
9

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