问题 解答题
直接写出得数.
4
5
×
3
4
=
12×
4
9
=
3
5
=
100×
2
25
=
2
9
÷
2
9
=
4
9
+
1
3
=
11
15
=
28×
4
21
=
5÷3=
7
10
-
2
5
=
答案

4
5
×
3
4
=
3
5
12×
4
9
=
16
3
3
5
=
5
3
100×
2
25
=8,
2
9
÷
2
9
=1,
4
9
+
1
3
=
7
9
11
15
=0,
28×
4
21
=
16
3
5÷3=
5
3
7
10
-
2
5
=
3
10

单项选择题
单项选择题