问题 解答题
直接写得数.
7
12
+
11
12
=
3
4
-
1
2
=
5
8
+
1
3
=
8
9
+
4
11
+
1
9
=
1-
5
12
=
9
13
-
4
13
=
5
6
+
4
9
=
3-
2
9
-
7
9
=
答案

7
12
+
11
12
=
3
2
3
4
-
1
2
=
1
4
5
8
+
1
3
=
23
24
8
9
+
4
11
+
1
9
=1
4
11
1-
5
12
=
7
12
9
13
-
4
13
=
5
13
5
6
+
4
9
=
23
18
3-
2
9
-
7
9
=2.

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