题目内容
比较下列各对有理数的大小:
(1)
和
;
(2)3
和-1
;
(3)-
和-
;
(4)-(-4
)和-(+
);
(5)-(+π)和0;
(6)-(-5)和-|-5|.
(1)
| 7 |
| 10 |
| 3 |
| 5 |
(2)3
| 1 |
| 2 |
| 1 |
| 9 |
(3)-
| 1 |
| 4 |
| 1 |
| 5 |
(4)-(-4
| 3 |
| 5 |
| 3 |
| 7 |
(5)-(+π)和0;
(6)-(-5)和-|-5|.
(1)∵
=
,
>
,
∴
>
;
(2)∵3
>0,-1
<0,
∴3
>-1
;
(3)∵|-
|=
,|-
|=
,
>
,
∴|-
|>|-
|,
∴-
<-
;
(4)∵-(-4
)=4
>0,-(+
)<0,
∴-(-4
)>-(+
);
(5)∵-(+π)=-π,
∴-(+π)<0;
(6)∵-(-5)=5,-|-5|=-5,且5>-5,
∴-(-5)>-|-5|.
| 3 |
| 5 |
| 6 |
| 10 |
| 7 |
| 10 |
| 6 |
| 10 |
∴
| 7 |
| 10 |
| 3 |
| 5 |
(2)∵3
| 1 |
| 2 |
| 1 |
| 9 |
∴3
| 1 |
| 2 |
| 1 |
| 9 |
(3)∵|-
| 1 |
| 4 |
| 1 |
| 4 |
| 1 |
| 5 |
| 1 |
| 5 |
| 1 |
| 4 |
| 1 |
| 5 |
∴|-
| 1 |
| 4 |
| 1 |
| 5 |
∴-
| 1 |
| 4 |
| 1 |
| 5 |
(4)∵-(-4
| 3 |
| 5 |
| 3 |
| 5 |
| 3 |
| 7 |
∴-(-4
| 3 |
| 5 |
| 3 |
| 7 |
(5)∵-(+π)=-π,
∴-(+π)<0;
(6)∵-(-5)=5,-|-5|=-5,且5>-5,
∴-(-5)>-|-5|.
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