> 其他 >
比较下列每对数的大小:
(1)|
3
5
|
|−
2
5
|

(2)-|-7|和-(-7)
(3)|-4|与-4;
(4)|-(-3)|与-|-3|;
(5)-
8
9
与-
7
9

(6)-
5
8
与-
7
11
人气:232 ℃ 时间:2019-11-01 11:52:25
解答
(1)∵|
3
5
|
=
3
5
|−
2
5
|
=
2
5
3
5
2
5
,∴|
3
5
|
|−
2
5
|

(2)∵-|-7|=-7,0,-(-7)=7>0,∴-|-7|<-(-7);
(3)∵|-4|=4>0,-4<0,∴|-4|>-4;
(4)∵|-(-3)|=3>0,-|-3|=-3<0,∴|-(-3)|>-|-3|;
(5)∵-
8
9
<0,-
7
9
<0,|-
8
9
|=
8
9
>|-
7
9
|=
7
9
,∴-
8
9
<-
7
9

(6)∵-
5
8
=-
55
88
<0,-
7
11
=-
56
88
<0,|-
55
88
|<|-
56
88
|,∴
5
8
7
11

答案为:>;<;>;>;<;>.
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