口算.
4
7
×
1
4
=

2
3
×
2
3
=

7
10
×5=

4
5
=

5
6
÷
5
3
=

5
8
-
1
4
=
分析:①②③屬于分?jǐn)?shù)乘法,約分即可;④⑤屬于分?jǐn)?shù)除法,把除法改為乘法,約分計算;⑥屬于分?jǐn)?shù)減法,通分計算.
解答:解:
4
7
×
1
4
=
1
7
;       
2
3
×
2
3
=
4
9
;       
7
10
×5=
7
2
;      4÷
4
5
=5;     
5
6
÷
5
3
=
1
2
;        
5
8
-
1
4
=
3
8
點評:此題屬于分?jǐn)?shù)的計算,根據(jù)題目類型,靈活解答.
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