15+35= 56-16= 13+12= 316+58=1-27= 120+34= 37-37+17= 34+18+14=

问题描述:

1
5
+
3
5
=
5
6
-
1
6
=
1
3
+
1
2
=
3
16
+
5
8
=
1-
2
7
=
1
20
+
3
4
=
3
7
-
3
7
+
1
7
=
3
4
+
1
8
+
1
4
=

1
5
+
3
5
=
4
5
5
6
-
1
6
=
2
3
1
3
+
1
2
=
5
6
3
16
+
5
8
=
13
16
1-
2
7
=
5
7
1
20
+
3
4
=
4
5
3
7
-
3
7
+
1
7
=
1
7
3
4
+
1
8
+
1
4
=1
1
8

答案解析: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,化成同分母分数,再相加减.
考试点:分数的加法和减法.
知识点:本题考查了基本的分数加减法运算,计算时要细心,注意把结果化成最简分数.