题目内容
比较下列各组数的大小.
(1)-
与-
; (2)|-(2.1)|与-(-2.1); (3)-3.2与-3
.
(1)-
| 2 |
| 3 |
| 3 |
| 4 |
| 1 |
| 8 |
(1)∵|-
|=
=
,|-
|=
=
,
<
,
∴-
>-
;
(2)∵|-(+2.1)|=2.1,-(-2.1)=2.1,
∴|-(+2.1)|=-(-2.1);
(3)∵|-3.2|=3.2,|-3
|=3
=3.125,3.2>3.125,
∴-3.2<-3
.
| 2 |
| 3 |
| 2 |
| 3 |
| 8 |
| 12 |
| 3 |
| 4 |
| 3 |
| 4 |
| 9 |
| 12 |
| 8 |
| 12 |
| 9 |
| 12 |
∴-
| 2 |
| 3 |
| 3 |
| 4 |
(2)∵|-(+2.1)|=2.1,-(-2.1)=2.1,
∴|-(+2.1)|=-(-2.1);
(3)∵|-3.2|=3.2,|-3
| 1 |
| 8 |
| 1 |
| 8 |
∴-3.2<-3
| 1 |
| 8 |
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