5
9
+
1
6
           
5
8
+
1
3
             
1
4
+
2
5
+
3
8

11
20
-
2
5

5
6
-
1
2

1-
2
7
-
1
2
分析:同分母分?jǐn)?shù)相加減,分子不變,分母相加減;
異分母分?jǐn)?shù)相加減,先通分,變成同分母的分?jǐn)?shù)相加減,再計(jì)算.
1
4
+
2
5
+
3
8
運(yùn)用加法交換律簡(jiǎn)算.
解答:解:解:
5
9
+
1
6
=
13
18
,
5
8
+
1
3
=
23
24

1
4
+
2
5
+
3
8
=
41
40
,
11
20
-
2
5
=
3
20
,
5
6
-
1
2
=
1
3

1-
2
7
-
1
2
=
3
14
點(diǎn)評(píng):口算題目要求快速準(zhǔn)確,能運(yùn)用簡(jiǎn)算方法的要簡(jiǎn)算.
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