问题 解答题
直接写出得数.
1
3
-
1
7
=
1
2
+
1
5
=
1
9
+
1
8
=
3
10
+
2
5
=
1-
13
18
=
1
9
-
1
10
=
3+
5
12
=
7
9
-
7
9
=
3-1
4
5
=
5
8
+
5
8
=
8
7
+
5
14
=
5
6
+3
1
3
=
答案

1
3
-
1
7
=
4
21
1
2
+
1
5
=
7
10
1
9
+
1
8
=
17
72
3
10
+
2
5
=
7
10
1-
13
18
=
5
18
1
9
-
1
10
=
1
90
3+
5
12
=3
5
12
7
9
-
7
9
=0
3-1
4
5
=1
1
5
5
8
+
5
8
=1
1
4
8
7
+
5
14
=1
1
2
5
6
+3
1
3
=4
1
6

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