题目内容
比较下列有理数的大小:
(1)-|-
|和-
(2)-
与-
.
(1)-|-
| 2 |
| 3 |
| 1 |
| 4 |
(2)-
| 11 |
| 12 |
| 12 |
| 13 |
(1)∵-|-
|=-
,-
=-
,
又
>
,
∴-
<-
,
即-|-
|<-
;
(2)∵|-
|=
=
,|-
|=
=
,
又
<
,
∴-
>-
.
| 2 |
| 3 |
| 8 |
| 12 |
| 1 |
| 4 |
| 3 |
| 12 |
又
| 8 |
| 12 |
| 3 |
| 12 |
∴-
| 8 |
| 12 |
| 3 |
| 12 |
即-|-
| 2 |
| 3 |
| 1 |
| 4 |
(2)∵|-
| 11 |
| 12 |
| 11 |
| 12 |
| 143 |
| 156 |
| 12 |
| 13 |
| 12 |
| 13 |
| 144 |
| 156 |
又
| 143 |
| 156 |
| 144 |
| 156 |
∴-
| 11 |
| 12 |
| 12 |
| 13 |
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