当前位置:文档之家› 通分约分专项练习30大题(有答案)

通分约分专项练习30大题(有答案)

1.把下面的分数化成分母是36,而大小不变的分数.
= = = = ==
2.通分
和和和和和.和和和.和和和和
3.把下面的分数约分.

19.把分数、和通分,并比较大小.
20.约分.
= = =
21.约分:
= = =
= =
23.把下面每组分数通分.
(1)和

(2)

(3)
(4)、和.
24.约分:

25.把下面各组分数通分,再比较大小.
①2和②和③和.
26.把下面不是最简分数的化成最简分数.
27.把下列每组分数化成分母相同而大小不变的分数.
和和和.
28.通分.(把下列各组分数化成分母相同的分数)
(1)和(2)和(3)和(4)和.
29.把下面每组分数通分
和和和和.30.和和、和.
通分约分专项练习30题参考答案:
1. ;




2.=;
=
=;
=;
3.①=,=;
②=,
=,
=.
4.,











5.(1)==;
==;
所以>;
(2)==;
==;
所以<;
(3)==;
==;
所以<
6.和,








7.;





=3;


8.(1);
=;
(2),

(3),

(4),
9.=;


=3;

10.==;
==;
==;
== 11.(1)和
==;
==;
所以)<;(2)和
==;
>,
所以)>;(3)和
==;
所以<12.=;
==;
== 13.==;
==;
==;
== 14.==,
==,
==,
==.
15.;
=1;



=2;
=;

16.==;
==;
==;
==5
17.(1);


(2)=2;
=3;=5.
18.==;
==;
==;
==;
==;
==
19.==1;
=;
==2;
==2;
==1;
=;
20.==;
==;
==;
>>,
所以>>
21.==;
==;
==
22. (1)==;
(2)==;
(3)==;
(4)==;
(5)==
23.(1)和,
==,
==;
(2)和,
==,
==;
(3)和,
==,
=;
(4)、和.
==,
==,
==.
24.;


=3;
25.①2===,
则2>;
②==,==,

则;
③==,==,

则.
26.=;
=;
=;
=
27.和
==;
==;

==;
=;

==
==
28.(1)和,
=,

(2)和,


(3)和,


(4)和,


29.(1)5和7的最小公倍数是35,
==;
==;
(2)6和9的最小公倍数是18,
==;
==;
(3)3和12的最小公倍数是12,
==;

(4,10和4的最小公倍数是20,
==;
==
30.①,

所以.
②12与15的最小公倍数是60,



即.
③12,8,16的最小公倍数是48,
=,



即,。

相关主题