先将下列各组数通分,再比较大小.23和14415和1538和5616和29.-数学

题目简介

先将下列各组数通分,再比较大小.23和14415和1538和5616和29.-数学

题目详情

先将下列各组数通分,再比较大小.
2
3
1
4

4
15
1
5
3
8
5
6
1
6
2
9
题型:解答题难度:中档来源:不详

答案

(1)class="stub"2
3
class="stub"1
4

class="stub"2
3
=class="stub"2×4
3×4
=class="stub"8
12

class="stub"1
4
=class="stub"1×3
4×3
=class="stub"3
12

因为class="stub"8
12
>class="stub"3
12

所以class="stub"2
3
>class="stub"1
4

(2)class="stub"4
15
class="stub"1
5

class="stub"4
15
=class="stub"4
15

class="stub"1
5
=class="stub"1×3
5×3
=class="stub"3
15

因为class="stub"4
15
>class="stub"3
15

所以class="stub"4
15
>class="stub"1
5

(3)class="stub"3
8
class="stub"5
6

class="stub"3
8
=class="stub"3×3
8×3
=class="stub"9
24

class="stub"5
6
=class="stub"5×4
6×4
=class="stub"20
24

因为class="stub"9
24
<class="stub"20
24

所以class="stub"3
8
<class="stub"5
6

(4)class="stub"1
6
class="stub"2
9

class="stub"1
6
=class="stub"1×3
6×3
=class="stub"3
18

class="stub"2
9
=class="stub"2×2
9×2
=class="stub"4
18

因为class="stub"3
18
<class="stub"4
18

所以class="stub"1
6
<class="stub"2
9

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