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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:分数乘法:分子相乘的积做分子,分母相乘的积做分母;
分数除法:除以一个不为零的数等于乘上这个数的倒数.
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.
点评:本题考查了简单的分数乘除法的计算,计算时要细心,注意把结果化成最简分数.
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