精英家教网 > 小学数学 > 题目详情
1
2
+
1
3
=
1
2
-
1
4
=
2
5
-
1
5
=
4
7
-
1
7
=
7
8
-
3
8
=
1
10
+
2
5
=
5
6
-
2
3
=
1
3
+
1
5
=
3
8
-
1
4
=
2
3
+
1
3
=
3
8
+
3
8
=
1
2
-
1
5
=
4
7
+
3
7
=
1-
7
8
=
5
6
+
5
6
=
1-
5
12
=
3
5
+
1
2
=
9
10
-
3
10
=
5
7
-
5
7
=
3
8
+
5
8
=
分析:根据分数加减法的计算方法进行计算.
解答:
解:
1
2
+
1
3
=
5
6
1
2
-
1
4
=
1
4
2
5
-
1
5
=
1
5
4
7
-
1
7
=
3
7
7
8
-
3
8
=
1
2
1
10
+
2
5
=
1
2
5
6
-
2
3
=
1
6
1
3
+
1
5
=
8
15
3
8
-
1
4
=
1
8
2
3
+
1
3
=1,
3
8
+
3
8
=
3
4
1
2
-
1
5
=
3
10
4
7
+
3
7
=1,
1-
7
8
=
1
8
5
6
+
5
6
=
5
3
1-
5
12
=
7
12
3
5
+
1
2
=
11
10
9
10
-
3
10
=
3
5
5
7
-
5
7
=0,
3
8
+
5
8
=1.
点评:同分母分数相加减,分母不变,只把分子相加减;
异分母分数相加减,先通分,然后再按照同分母分数加减法进行计算.
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