先通分,再比较大小.1118和512;49和58;1324和58.-数学

题目简介

先通分,再比较大小.1118和512;49和58;1324和58.-数学

题目详情

先通分,再比较大小.
11
18
5
12
4
9
5
8
13
24
5
8
题型:解答题难度:中档来源:不详

答案

class="stub"11
18
和class="stub"5
12

class="stub"11
18
=class="stub"11×2
18×2
=class="stub"22
36

class="stub"5
12
=class="stub"5×3
12×3
=class="stub"15
36

因为class="stub"22
36
>class="stub"15
36

所以class="stub"11
18
>class="stub"5
12


class="stub"4
9
和class="stub"5
8

class="stub"4
9
=class="stub"4×8
9×8
=class="stub"32
72

class="stub"5
8
=class="stub"5×9
8×9
=class="stub"45
72

因为class="stub"32
72
<class="stub"45
72

所以class="stub"4
9
<class="stub"5
8


class="stub"13
24
和class="stub"5
8

class="stub"13
24
=class="stub"13
24

class="stub"5
8
=class="stub"5×3
8×3
=class="stub"15
24

因为class="stub"13
24
<class="stub"15
24

所以class="stub"13
24
<class="stub"5
8

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