精英家教网 > 小学数学 > 题目详情
2
5
+
3
5
+
3
5
27
28
-
5
28
-
15
28
11
20
+
7
20
+
3
20
13
18
-
5
18
-
7
18
分析:根据同分母分数加减法的计算方法进行计算.
解答:解:(1)
2
5
+
3
5
+
3
5

=
2+3+3
5

=
8
5


(2)
27
28
-
5
28
-
15
28

=
27-5-15
28

=
7
28

=
1
4


(3)
11
20
+
7
20
+
3
20

=
11+7+3
20

=
21
20


(4)
13
18
-
5
18
-
7
18

=
13-5-7
18

=
1
18
点评:同分母分数相加减,分母不变,只把分子相加减.
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