比较下列有理数的大小:(1)-|-23|和-14(2)-1112与-1213.-数学

题目简介

比较下列有理数的大小:(1)-|-23|和-14(2)-1112与-1213.-数学

题目详情

比较下列有理数的大小:
(1)-|-
2
3
|
-
1
4
                       
(2)-
11
12
-
12
13
题型:解答题难度:中档来源:不详

答案

(1)∵-|-class="stub"2
3
|=-class="stub"8
12
,-class="stub"1
4
=-class="stub"3
12

class="stub"8
12
class="stub"3
12

∴-class="stub"8
12
<-class="stub"3
12

即-|-class="stub"2
3
|<-class="stub"1
4


(2)∵|-class="stub"11
12
|=class="stub"11
12
=class="stub"143
156
,|-class="stub"12
13
|=class="stub"12
13
=class="stub"144
156

class="stub"143
156
class="stub"144
156

∴-class="stub"11
12
>-class="stub"12
13

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