试题:
直接写出得数.
2
7
+
4
7
=
7
10
+
3
10
=
5
6
-
1
6
=
1
2
-
1
4
=
1-
2
5
=
1
2
+
1
4
=
1
2
-
1
3
=
3
4
+
1
6
=

答案:

我来补答

2
7
+
4
7
=
6
7
7
10
+
3
10
=1,
5
6
-
1
6
=
2
3
1
2
-
1
4
=
1
4
1-
2
5
=
3
5
1
2
+
1
4
=
3
4
1
2
-
1
3
=
1
6
3
4
+
1
6
=
11
12
 
 
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