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2
5
÷4
=
5
6
×4
=
14
15
=
1
16
=
8
21
÷
4
7
=
8
15
×
5
6
=
3
5
÷9÷
1
15
=
2
3
÷
2
3
×
1
3
=
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0的数,等于乘上这个数的倒数.
解答:解:
2
5
÷4
=
1
10
5
6
×4
=
10
3
14
15
=
15
2
1
16
=
9
16
8
21
÷
4
7
=
2
3
8
15
×
5
6
=
4
9
3
5
÷9÷
1
15
=1
2
3
÷
2
3
×
1
3
=
1
3
点评:本题考查了基本的计算,计算时要细心,注意把结果化成最简分数.
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