问题 解答题
1
3
+
5
9
=
5
8
-
3
16
=
1
2
×
4
7
=
1
4
+
1
3
=
8-
5
6
=
2
3
=
5
12
×
3
4
=
2
7
×4
=
4
21
×
7
8
=
5
9
-
1
3
=
答案

1
3
+
5
9
=
8
9
5
8
-
3
16
=
7
16
1
2
×
4
7
=
2
7
1
4
+
1
3
=
7
12
8-
5
6
=7
1
6
2
3
=6
5
12
×
3
4
=
5
16
2
7
×4
=
8
7
4
21
×
7
8
=
1
6
5
9
-
1
3
=
2
9

单项选择题
单项选择题