题目内容
比较下列各数的大小(要有解答过程):(1)-
| 13 |
| 24 |
| 5 |
| 8 |
(2)-
| 5 |
| 6 |
| 6 |
| 7 |
| 17 |
| 21 |
分析:根据有理数大小比较的法则进行计算.
解答:解:(1)∵|-
|=
,|-
|=
=
,
<
∴-
>-
(2)∵|
|=
=
,|-
|=
=
,|-
|=
=
,
>
>
,
∴-
<-
<-
| 13 |
| 24 |
| 13 |
| 24 |
| 5 |
| 8 |
| 5 |
| 8 |
| 15 |
| 24 |
| 13 |
| 24 |
| 15 |
| 24 |
| 13 |
| 24 |
| 5 |
| 8 |
(2)∵|
| 5 |
| 6 |
| 5 |
| 6 |
| 35 |
| 42 |
| 6 |
| 7 |
| 6 |
| 7 |
| 36 |
| 42 |
| 17 |
| 21 |
| 17 |
| 21 |
| 34 |
| 42 |
| 36 |
| 42 |
| 35 |
| 42 |
| 34 |
| 42 |
∴-
| 6 |
| 7 |
| 5 |
| 6 |
| 17 |
| 21 |
点评:此题考查了有理数大小比较的法则:
①正数都大于0;
②负数都小于0;
③正数大于一切负数;
④两个负数,绝对值大的其值反而小.
①正数都大于0;
②负数都小于0;
③正数大于一切负数;
④两个负数,绝对值大的其值反而小.
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