2
5
7
×
3
4
=
7
9
÷
9
7
=
6
5
×
4
3
=
5
7
÷
15
2
=
8
9
×
3
4
=
5
6
÷
5
3
=
19
20
×
15
38
=
9
10
÷
3
2
=
分析:運用分數(shù)的乘除法的計算法則進行計算,注意結(jié)果的化簡,化成最簡分數(shù).
解答:
解:2
5
7
×
3
4
=2
1
28
,
7
9
÷
9
7
=
49
81
,
6
5
×
4
3
=1
3
5
,
5
7
÷
15
2
=
2
21
,
8
9
×
3
4
=
2
3
5
6
÷
5
3
=
1
2
,
19
20
×
15
38
=
3
8
9
10
÷
3
2
=
3
5
,
點評:本題考查了分數(shù)的乘除法的計算法則,同時考查了學生的計算能力.
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