题目内容

直接写得数.
4
5
-
3
4
=

5
6
-
1
6
=

1-
7
12
=

1
2
-
1
3
=

3
4
-
3
8
=
1
2
-
1
6
=
5
12
+
7
24
=
7
8
+
3
8
=
2
5
+
3
4
=
1-
1
2
-
1
4
=
分析:同分母分数相加减,分母不变,分子相加减;异分母分数相加减,先通分,化成同分母的分数,然后再计算.
解答:解:
4
5
-
3
4
=
1
20

5
6
-
1
6
=
2
3

1-
7
12
=
5
12

1
2
-
1
3
=
1
6

3
4
-
3
8
=
3
8
1
2
-
1
6
=
1
3
5
12
+
7
24
=
17
24
7
8
+
3
8
=
5
4
2
5
+
3
4
=
23
20
1-
1
2
-
1
4
=
1
4
故答案为:
1
20
2
3
5
12
1
6
3
8
1
3
17
24
5
4
23
20
1
4
点评:本题考查了简单的分数加减法,注意把结果化成最简分数.
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