题目内容
比较下列每对数的大小:|| 2 |
| 3 |
| 2 |
| 5 |
| 6 |
| 3 |
| 1 |
| 6 |
| 2 |
| 11 |
| 3 |
| 7 |
| 2 |
| 5 |
分析:本题涉及绝对值,因此需先将绝对值求出后在进行比较.
解答:解:|
|=
,|
|=
,因此可得|
|>|
|,
|2|=2,|-
|=2,因此可得|2|=|-
|,
|-
|=
,|
|=
,化为分母为66的分数,|-
|=
,|
|=
,因此可得|-
|<|
|,
|-
|=
,|-
|=
,化为分母为35的分数,|-
|=
,|-
|=
,因此可得|-
|>|-
|.
| 2 |
| 3 |
| 2 |
| 3 |
| 2 |
| 5 |
| 2 |
| 5 |
| 2 |
| 3 |
| 2 |
| 5 |
|2|=2,|-
| 6 |
| 3 |
| 6 |
| 3 |
|-
| 1 |
| 6 |
| 1 |
| 6 |
| 2 |
| 11 |
| 2 |
| 11 |
| 1 |
| 6 |
| 11 |
| 66 |
| 2 |
| 11 |
| 12 |
| 66 |
| 1 |
| 6 |
| 2 |
| 11 |
|-
| 3 |
| 7 |
| 3 |
| 7 |
| 2 |
| 5 |
| 2 |
| 5 |
| 3 |
| 7 |
| 15 |
| 35 |
| 2 |
| 5 |
| 14 |
| 35 |
| 3 |
| 7 |
| 2 |
| 5 |
点评:本题考查有理数大小的比较,还结合绝对值的知识点,学生在做此题时,一定要注意绝对值符号.
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