问题 解答题
计算下面各题.
20×
2
5
=
1
3
÷
3
8
=
8
21
×
7
16
=
1
6
+
2
5
=
3
4
÷6=
3
4
×12=
2
13
÷8=
2-
7
9
=
答案

20×
2
5
=8;
1
3
÷
3
8
=
1
3
×
8
3
=
8
9
8
21
×
7
16
=
1
6
1
6
+
2
5
=
5
30
+
12
30
=
17
30
3
4
÷6=
3
4
×
1
6
=
1
8
3
4
×12=9;
2
13
÷8=
2
13
×
1
8
=
1
52
2-
7
9
=1
2
9

单项选择题
单项选择题