问题 填空题
2
2
7
=
()
21

2
2
9
=40÷(  )
15
()
=
3
8
=9÷(  )
答案

2

2
7
=
16
7
=
48
21

2

2
9
=
20
9
=40÷18;

3
8
=
15
40
=9÷24.

故答案为:48,18,40,24.

解答题
单项选择题