题目内容
（1）先计算下面各题，再看看有什么规律．
+
=
-
=
+
=
-
=
+
=
-
=
（2）根据上面的规律，直接写出下面各题的得数．
+
=
-
=
+
=
-
=
+
=
-
=
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 3 |
| 1 |
| 4 |
| 1 |
| 3 |
| 1 |
| 4 |
| 1 |
| 4 |
| 1 |
| 5 |
| 1 |
| 4 |
| 1 |
| 5 |
（2）根据上面的规律，直接写出下面各题的得数．
| 1 |
| 3 |
| 1 |
| 5 |
| 1 |
| 7 |
| 1 |
| 8 |
| 1 |
| 2 |
| 1 |
| 7 |
| 1 |
| 3 |
| 1 |
| 7 |
| 1 |
| 8 |
| 1 |
| 5 |
| 1 |
| 4 |
| 1 |
| 9 |
分析：根据分数加减法的计算方法进行计算．
解答：解：
+
=
-
=
+
=
-
=
+
=
-
=
我发现：分子是1，分母是互质数的两个分数相加减，分母的乘积作为分母，分母相加减作为分子．
（2）
+
=
-
=
+
=
-
=
+
=
-
=
．
| 1 |
| 2 |
| 1 |
| 3 |
| 5 |
| 6 |
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 6 |
| 1 |
| 3 |
| 1 |
| 4 |
| 7 |
| 12 |
| 1 |
| 3 |
| 1 |
| 4 |
| 1 |
| 12 |
| 1 |
| 4 |
| 1 |
| 5 |
| 9 |
| 20 |
| 1 |
| 4 |
| 1 |
| 5 |
| 1 |
| 20 |
我发现：分子是1，分母是互质数的两个分数相加减，分母的乘积作为分母，分母相加减作为分子．
（2）
| 1 |
| 3 |
| 1 |
| 5 |
| 8 |
| 15 |
| 1 |
| 7 |
| 1 |
| 8 |
| 1 |
| 56 |
| 1 |
| 2 |
| 1 |
| 7 |
| 9 |
| 14 |
| 1 |
| 3 |
| 1 |
| 7 |
| 4 |
| 21 |
| 1 |
| 8 |
| 1 |
| 5 |
| 13 |
| 40 |
| 1 |
| 4 |
| 1 |
| 9 |
| 5 |
| 36 |
点评：异分母分数相加减，先通分，然后再按照同分母分数的加减法进行计算．
练习册系列答案
每日10分钟口算心算速算天天练系列答案
相关题目
等待着你发现．
+
=
=
=
-
=
=