精英家教网 > 小学数学 > 题目详情
3
8
+
1
8
=
5
9
-
2
9
=
5
6
-
5
6
=
1
3
+
1
2
=
1-
5
8
=
7
10
+
5
10
=
3
4
-
1
2
=
3
4
-
3
4
=
5
11
+
4
11
=
分析:同分母分数相加减,分子不变,分母相加减;
异分母分数相加减,先通分,变成同分母的分数相加减,再计算.
解答:解:
3
8
+
1
8
=
1
2

5
9
-
2
9
=
1
3

5
6
-
5
6
=0,
1
3
+
1
2
=
5
6

1-
5
8
=
3
8

7
10
+
5
10
=
6
5

3
4
-
1
2
=
1
4

3
4
-
3
4
=0,
5
11
+
4
11
=
9
11
点评:本题考查了分数的加减法,计算时要细心,注意把结果化成最简分数.
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