直接寫出得數(shù)
1
3
+
1
7
=
1
4
-
1
5
=
2
3
-
5
12
=
2
3
-
1
5
=
3
4
+
2
7
-
3
4
=
1-
5
8
=
4
11
+
7
11
=
2
7
+
3
4
+
5
7
=
7
8
-
1
2
=
2
9
+
4
9
=
1
3
+
1
7
=
10
21
1
4
-
1
5
=
1
20
2
3
-
5
12
=
1
4
2
3
-
1
5
=
7
15
3
4
+
2
7
-
3
4
=
2
7
1-
5
8
=
3
8
4
11
+
7
11
=1
2
7
+
3
4
+
5
7
=1
3
4
7
8
-
1
2
=
3
8
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