直接寫出得數(shù):
2
9
+
3
9
=
8
12
-
5
12
=
1-
5
6
=
1
2
+
1
3
=
7
8
-
2
8
=
4+
6
7
=
3
8
-
1
4
=
4
5
+
1
5
=
9
10
-
1
2
=
2
3
+
1
4
=
分析:根據(jù)分數(shù)的加法和減法進行計算即可得到答案.
解答:解:
2
9
+
3
9
=
5
9
8
12
-
5
12
=
1
4
1-
5
6
=
1
6
1
2
+
1
3
=
5
6
7
8
-
2
8
=
5
8
4+
6
7
=4
6
7
3
8
-
1
4
=
1
8
4
5
+
1
5
=1
9
10
-
1
2
=
2
5
2
3
+
1
4
=
11
12
故填:
5
9
1
4
,
1
6
5
6
,
5
8
,4
6
7
,
1
8
,1,
2
5
,
11
12
點評:此題主要考查的是分數(shù)的加法與減法的運算.
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