题目内容

把下列各分数约分.
4
8
=
12
18
=
15
80
=
21
49
=
10
15
=
48
100
=
9
72
=
24
40
=
13
65
=
35
50
=
分析:利用分数的基本性质,即分数的分子和分母同时乘上或除以相同的数(0除外),分数的大小不变,从而可以正确进行作答.
解答:解:
4
8
=
4÷4
8÷4
=
1
2


12
18
=
12÷6
18÷6
=
2
3


15
80
=
15÷5
80÷5
=
3
16


21
49
=
21÷7
49÷7
=
3
7


10
15
=
10÷5
15÷5
=
2
3


48
100
=
48÷4
100÷4
=
12
25


9
72
=
9÷9
72÷9
=
1
8


24
40
=
24÷8
40÷8
=
3
5


13
65
=
13÷13
65÷13
=
1
5


35
50
=
35÷5
50÷5
=
7
10
点评:此题主要考查分数的基本性质的灵活应用.
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