试题:
3
9
+
5
9
1
6
+
5
6
3
8
+
3
8
8
11
-
3
11
7
12
-
5
12
1-
2
7
7
16
+
5
16
-
9
16
8
9
-
5
9
+
2
9

答案:

我来补答
3
9
+
5
9
=
8
9
1
6
+
5
6
=1,
3
8
+
3
8
=
3
4
8
11
-
3
11
=
5
11
7
12
-
5
12
=
1
6
1-
2
7
=
5
7
7
16
+
5
16
-
9
16
=
3
16
8
9
-
5
9
+
2
9
=
5
9
 
 
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