32÷
2
3
=
2
5
÷
1
2
=
5
12
÷8
=
100×
2
3
=
1
5
×
3
4
=
4.2÷2.1=
2
9
÷
1
2
=
7
18
÷1
=
15÷
3
4
=
分析:分數(shù)乘法:分子相乘的積做分子,分母相乘的積做分母;
分數(shù)除法:除以一個不為零的數(shù)等于乘上這個數(shù)的倒數(shù).
解答:解:
32÷
2
3
=48,
2
5
÷
1
2
=
4
5
,
5
12
÷8
=
5
96
,
100×
2
3
=
200
3
,
1
5
×
3
4
=
3
20
,
4.2÷2.1=2,
2
9
÷
1
2
=
4
9
,
7
18
÷1
=
7
18
15÷
3
4
=20.
點評:本題考查了簡單的分數(shù)乘除法的計算,計算時要細心,注意把結果化成最簡分數(shù).
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