题目内容

计算(写出计算过程)
1
8
+
5
8
=
12
17
-
10
17
=
7
20
+
3
20
=
11
18
-
7
18
+
3
18
=
7
15
+
2
15
-
9
15
=
5
12
+
5
12
+
1
12
=
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)
1
8
+
5
8

=
1+5
8

=
6
8

=
3
4


(2)
12
17
-
10
17

=
12-10
17

=
2
17


(3)
7
20
+
3
20

=
7+3
20

=
10
20

=
1
2


(4)
11
18
-
7
18
+
3
18

=
11-7+3
18

=
7
18


(5)
7
15
+
2
15
-
9
15

=
7+2-9
15

=0;

(6)
5
12
+
5
12
+
1
12

=
5+5+1
12

=
11
12
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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