问题 解答题
直接写出得数.
7
9
+
5
12
=
1
2
+
1
4
=
1-
9
13
=
2
19
+
17
19
=
3
4
+
4
5
=
1
4
-
1
5
=
1-
7
8
-
1
8
=
3
5
+
7
15
+
8
15
=
答案

7
9
+
5
12
=
43
36
1
2
+
1
4
=
3
4
1-
9
13
=
4
13
2
19
+
17
19
=1,
3
4
+
4
5
=
31
20
1
4
-
1
5
=
1
20
1-
7
8
-
1
8
=0,
3
5
+
7
15
+
8
15
=1
3
5

单项选择题
问答题