题目内容

直接写出结果.
1
4
-
1
5
=
3
7
+
4
7
=
3
4
+
5
4
=
7
8
-
1
4
=
5
8
+
1
8
=
5
9
-
2
9
=
1+
3
7
=
1
5
-
1
6
=
4
15
+
8
15
=
5-
12
13
=
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,变成同分母分数再相加减;据此计算即可.
解答:解:
1
4
-
1
5
=
1
20
3
7
+
4
7
=1,
3
4
+
5
4
=2,
7
8
-
1
4
=
5
8
5
8
+
1
8
=
3
4
5
9
-
2
9
=
1
3
1+
3
7
=1
3
7
1
5
-
1
6
=
1
30
4
15
+
8
15
=
4
5
5-
12
13
=4
1
13
点评:本题考查了分数加减法的计算法则,注意把结果化成最简分数.
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