下列比较大小,正确的是()A.-23<-710B.-89<-59C.37<-13D.29<15-数学

题目简介

下列比较大小,正确的是()A.-23<-710B.-89<-59C.37<-13D.29<15-数学

题目详情

下列比较大小,正确的是(  )
A.-
2
3
-
7
10
B.-
8
9
-
5
9
C.
3
7
-
1
3
D.
2
9
1
5
题型:单选题难度:中档来源:不详

答案

A、|-class="stub"2
3
|=class="stub"2
3
=class="stub"20
30
,|-class="stub"7
10
|=class="stub"7
10
=class="stub"21
30

class="stub"20
30
 < class="stub"21
30

∴-class="stub"2
3
>-class="stub"7
10
,所以错误;
B、|-class="stub"8
9
|=class="stub"8
9
,|-class="stub"5
9
|=class="stub"5
9

class="stub"8
9
> class="stub"5
9

∴-class="stub"8
9
<-class="stub"5
9
,正确;
C、class="stub"3
7
>-class="stub"1
3
,所以错误;
D、class="stub"2
9
=class="stub"10
45
class="stub"1
5
=class="stub"9
45

class="stub"10
45
 > class="stub"9
45

class="stub"2
9
class="stub"1
5
,所以错误.
故选B.

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