题目内容

直接写得数.
5
8
+
7
8
=
3
2
3
2
8
9
+
7
9
=
5
3
5
3
5
6
+3
=
3
5
6
3
5
6
5
12
1
12
=
1
3
1
3
6
7
-
3
7
=
3
7
3
7
1
3
-
1
4
=
1
12
1
12
1-
1
3
=
2
3
2
3
1
5
+
1
6
=
11
30
11
30
3
4
-
3
4
=
0
0
5-
9
14
=
61
14
61
14
分析:(1)同分母的分数相加减,分母不变,分子相加减;
(2)异分母的分数相加减,先通分,化成同分母的分数,再相加减.
解答:
解:
5
8
+
7
8
=
12
8
=
3
2

8
9
+
7
9
=
15
9
=
5
3
5
6
+3
=3
5
6

5
12
1
12
=
4
12
=
1
3

6
7
-
3
7
=
3
7

1
3
-
1
4
=
4
12
-
3
12
=
1
12
1-
1
3
=
2
3

1
5
+
1
6
=
6
30
+
5
30
=
11
30

 
3
4
-
3
4
=0,
5-
9
14
=
70
14
-
9
14
=
61
14
故答案依次为:
3
2
5
3
3
5
6
1
3
3
7
1
12
2
3
11
30
,0,
61
14
点评:此题主要考查了分数加、减法的计算方法.
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