问题 解答题
直接写出得数
7
2
×
4
21
=
1-
3
4
=
10
9
÷1=
5
6
÷
5
12
=
7
9
×
9
28
=
2.5×
4
5
=
3
5
×
5
9
=
52×
4
13
=
1
2
×
1
3
÷
1
3
×
1
2
=
0÷5×
2
5
=
答案

7
2
×
4
21
=
2
3
1-
3
4
=
1
4
10
9
÷1=
10
9
5
6
÷
5
12
=2
7
9
×
9
28
=
1
4
2.5×
4
5
=2
3
5
×
5
9
=
1
3
52×
4
13
=16
1
2
×
1
3
÷
1
3
×
1
2
=
1
4
0÷5×
2
5
=0
故答案为:
2
3
1
4
10
9
,2,
1
4
,2,
1
3
,16,
1
4
,0.

问答题
名词解释