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通分约分专项练习30大题(有答案)

2020-07-06 来源:年旅网
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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

3.把下面的分数约分.

和.

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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) 和

(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 .

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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.

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 30.

、和

和.

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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.

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; ; ; ;

; =3;

; 8.(1)

; =;

(2)

, ;(3)

, ;(4)

9.=

; ; ; =3; ;

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10.==; =

=;

==;

=

= 11.(1)

和 ==;

=

=;

所以)<; (2)

==;

, 所以)>;

(3)

=

=; 所以< 12.

=

; ==; == 13.

==; ==; ==

== 14.

==,

=

=,

==, =

=.

15.

=1;

=2;

=; . 16.

==; ==

==;

=

=5

17.(1)

; ; ;

(2)

=2;

=3;

=5.

18.=

=;

=

=;

==;

==;

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==

19.

==1;

=; ==2;

=

=2;

=

=1

; =;

20.=

=

==; ==;

, 所以>>

21.

=

=;

==;

=

= 22. (1)=

=;

(2)

=

=; (3)=

=;

(4)==;

(5)==

23.(1)和 ,

==,

==;

(2)和 ,

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==, =

=

; (3)和 , ==

=; (4)、和 .

==, ==, ==.

24.

; ;

=3;

25.①2==

=

则2>; ②=

=,

=

=

,,

则; ③=

=

,=

=

,,

则.

26.

=;

=; =; =

27.和 ==;

==

和 ==; =; 和

== =

=

28.(1)和, =,

; (2)和,

, ;

(3)和,

, ; (4)和

, , .

29.(1)5和7的最小公倍数是35,

=

=

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==;

(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,

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