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

2
9
+
3
9
=
5
9
; ②
8
12
-
5
12
=
1
4
; ③1-
5
6
=
1
6
; ④
1
2
+
1
3
=
5
6

4+

6
7
=4
6
7
; ⑥
3
8
-
1
4
=
1
8
; ⑦
9
10
-
1
2
=
2
5
;⑧
2
3
+
1
4
=
11
12

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