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口算.
1
3
+
1
4
=
1
5
-
1
6
=
1-
5
8
=
1
4
+
1
5
=
2
7
+
1
3
=
1-
7
15
=
3
4
-
1
6
=
7
10
-
1
2
=
3
8
-
1
4
=
5
9
-
4
9
=
1
2
-
1
4
=
1-
13
13
=
分析:通过观察,除了
5
9
-
4
9
外,都是异分母分数的运算,异分母分数的运算,先通分,再计算.
5
9
-
4
9
是同分母分数的计算,同分母分数的计算,只把分子相加减,分母不变.
解答:解:
1
3
+
1
4
=
7
12
1
5
-
1
6
=
1
30
1-
5
8
=
3
8
1
4
+
1
5
=
9
20
2
7
+
1
3
=
13
21
1-
7
15
=
8
15
3
4
-
1
6
=
7
12
7
10
-
1
2
=
1
5
3
8
-
1
4
=
1
8
5
9
-
4
9
=
1
9
1
2
-
1
4
=
1
4
1-
13
13
=0.
点评:掌握同分母和异分母分数运算的法则,是解题的关键.
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