3
5
=
=
9
15
                  
2
30
4
10

4
14
16
28
                     
2
1
3
=
=
2
5
15
分析:本題可根據(jù)分數(shù)的基本性質將每組中的分數(shù)通分或約分后比較大。
解答:解:
3
5
=
3×3
5×3
=
9
15
;
4
10
=
4×3
10×3
=
12
30
2
30
,即
2
30
4
10
;
4
14
=
4×2
14×2
=
8
28
16
28

2
1
3
=2
1×5
3×5
=2
5
15

故答案為:=,<,<,=.
點評:比較異分母分數(shù)的大小時,可將它們通分后化成同分母分數(shù)后,再進行比較.
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