问题 解答题
直接写出得数
1
2
+
1
3
=
1
5
-
1
6
=
1-
1
5
=
3-
3
4
=
7
20
-
12
20
=
2-(
1
4
-
1
8
)=
1-
5
11
-
6
11
=
11
13
+
2
13
-
7
13
=
答案

1
2
+
1
3
=
5
6
1
5
-
1
6
=
1
30
1-
1
5
=
4
5
3-
3
4
=2
1
4
7
20
-
12
20
=-
1
4
2-(
1
4
-
1
8
)=1
7
8
1-
5
11
-
6
11
=0,
11
13
+
2
13
-
7
13
=
6
13

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