题目内容

15
16
-
7
16
=
3
8
+
2
8
=
6
9
+
3
9
=
1-
13
18
=
11
15
11
15
-
7
15
=
4
15
5
6
5
6
+
1
6
=1
3
20
+
10
20
10
20
=
13
20
1-
8
11
8
11
=
3
11
分析:根据同分母分数加减法的计算方法进行计算.
(  )-
7
15
=
4
15
求被减数,用差加减数即可;
(  )+
1
6
=1,
3
20
+(  )=
13
20
,求未知加数,用和减去已知加数即可;
1-(  )=
3
11
,求减数,用被减数减去差即可.
解答:解:
15
16
-
7
16
=
1
2
3
8
+
2
8
=
5
8
6
9
+
3
9
=1,
1-
13
18
=
5
18
11
15
-
7
15
=
4
15
5
6
+
1
6
=1,
3
20
+
10
20
=
13
20
1-
8
11
=
3
11
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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