看誰算得又對又快.
1-
1
3
=
3
7
+
2
7
=
3
7
+
4
7
=
1
6
+
2
6
=
7
8
-
3
8
=
7
10
+
2
10
=.
1-
1
3
=
2
3
3
7
+
2
7
=
5
7
,
3
7
+
4
7
=1,
1
6
+
2
6
=
1
2
,
7
8
-
3
8
=
1
2
,
7
10
+
2
10
=
9
10
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