问题 解答题
直接写出得数
1
2
+
1
3
=
2
5
-
1
6
=
2
5
+
3
8
=
④1-
7
8
=
2
7
-
1
4
=
3
5
+
2
9
=
7
20
+
12
20
=
⑧1-
5
11
-
6
11
=
⑨6-(
1
4
-
1
8
)=
2
13
+
2
7
+
11
13
=
答案

1
2
+
1
3
=
5
6
2
5
-
1
6
=
7
30
2
5
+
3
8
=
31
40
④1-
7
8
=
1
8
2
7
-
1
4
=
1
28
3
5
+
2
9
=
37
45
7
20
+
12
20
=
19
20
⑧1-
5
11
-
6
11
=0,
⑨6-(
1
4
-
1
8
)=5
7
8
2
13
+
2
7
+
11
13
=1
2
7

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