问题 填空题
在括号里填上适当的数.
7
12
=
7×()
12×()
=
21
()
6
42
=
6÷()
42÷()
=
()
7

1
2
=
()
8
4
10
=
()
5
16
18
=
8
()
3
5
=
12
()

8
24
=
()
3
=
2
()
6
10
=
()
20
=
3
()
=
18
()
答案

(1)

7
12
=
7×(2)
12×(2)
=
21
(36)

(2)

6
42
=
6÷(6)
42÷(6)
=
(1)
7

(3)

1
2
=
(4)
8

(4)

4
10
=
(2)
5

(5)

16
18
=
8
(9)

(6)

3
5
=
12
(20)

(7)

8
24
=
(1)
3
=
2
(6)

(8)

6
10
=
(12)
20
=
3
(5)
=
18
(30)

故答案为:2,36; 6,1;4;2;9;20;1,6;12,5,30.

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