比较下列各对有理数的大小:(1)710和35;(2)312和-119;(3)-14和-15;(4)-(-435)和-(+37);(5)-(+π)和0;(6)-(-5)和-|-5|.-数学

题目简介

比较下列各对有理数的大小:(1)710和35;(2)312和-119;(3)-14和-15;(4)-(-435)和-(+37);(5)-(+π)和0;(6)-(-5)和-|-5|.-数学

题目详情

比较下列各对有理数的大小:
(1)
7
10
3
5

(2)3
1
2
-1
1
9

(3)-
1
4
-
1
5

(4)-(-4
3
5
)
-(+
3
7
)

(5)-(+π)和0;
(6)-(-5)和-|-5|.
题型:解答题难度:中档来源:不详

答案

(1)∵class="stub"3
5
=class="stub"6
10
class="stub"7
10
class="stub"6
10

class="stub"7
10
class="stub"3
5


(2)∵3class="stub"1
2
>0,-1class="stub"1
9
<0,
∴3class="stub"1
2
>-1class="stub"1
9


(3)∵|-class="stub"1
4
|=class="stub"1
4
,|-class="stub"1
5
|=class="stub"1
5
class="stub"1
4
class="stub"1
5

∴|-class="stub"1
4
|>|-class="stub"1
5
|,
∴-class="stub"1
4
<-class="stub"1
5


(4)∵-(-4class="stub"3
5
)=4class="stub"3
5
>0,-(+class="stub"3
7
)<0,
∴-(-4class="stub"3
5
)>-(+class="stub"3
7
);

(5)∵-(+π)=-π,
∴-(+π)<0;

(6)∵-(-5)=5,-|-5|=-5,且5>-5,
∴-(-5)>-|-5|.

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