先通分再比较大小1536和491112和131547和58.-数学

题目简介

先通分再比较大小1536和491112和131547和58.-数学

题目详情

先通分再比较大小
15
36
4
9

11
12
13
15

4
7
5
8
题型:解答题难度:中档来源:不详

答案

class="stub"15
36
class="stub"4
9

class="stub"15
36
=class="stub"15
36

class="stub"4
9
=class="stub"4×4
9×4
=class="stub"16
36

因为class="stub"15
36
<class="stub"16
36

所以class="stub"15
36
<class="stub"4
9


class="stub"11
12
class="stub"13
15

class="stub"11
12
=class="stub"11×5
12×5
=class="stub"55
60

class="stub"13
15
=class="stub"13×4
15×4
=class="stub"52
60

因为class="stub"55
60
>class="stub"52
60

所以class="stub"11
12
>class="stub"13
15


class="stub"4
7
class="stub"5
8

class="stub"4
7
=class="stub"4×8
7×8
=class="stub"32
56

class="stub"5
8
=class="stub"5×7
8×7
=class="stub"35
56

因为class="stub"32
56
<class="stub"35
56

所以class="stub"4
7
<class="stub"5
8

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