题目内容
写出一个分母是10,且大小在-
和-
之间的分数是
| 2 |
| 3 |
| 1 |
| 3 |
-
,-
,-
| 4 |
| 10 |
| 5 |
| 10 |
| 6 |
| 10 |
-
,-
,-
.| 4 |
| 10 |
| 5 |
| 10 |
| 6 |
| 10 |
分析:先计算|-
|=
=
,|-
|=
=
,再根据负数的绝对值越大,这个数越小得到-
<-
<-
<-
<-
,然后化简分式即可.
| 2 |
| 3 |
| 2 |
| 3 |
| 20 |
| 30 |
| 1 |
| 3 |
| 1 |
| 3 |
| 10 |
| 30 |
| 2 |
| 3 |
| 18 |
| 30 |
| 15 |
| 30 |
| 12 |
| 30 |
| 1 |
| 3 |
解答:解:∵|-
|=
=
,|-
|=
=
,
而
<
<
<
,
∴-
<-
<-
<-
<-
,
满足条件的分数为-
,-
,-
.
故答案为-
,-
,-
.
| 2 |
| 3 |
| 2 |
| 3 |
| 20 |
| 30 |
| 1 |
| 3 |
| 1 |
| 3 |
| 10 |
| 30 |
而
| 10 |
| 30 |
| 12 |
| 30 |
| 15 |
| 30 |
| 18 |
| 30 |
∴-
| 2 |
| 3 |
| 18 |
| 30 |
| 15 |
| 30 |
| 12 |
| 30 |
| 1 |
| 3 |
满足条件的分数为-
| 6 |
| 10 |
| 5 |
| 10 |
| 4 |
| 10 |
故答案为-
| 6 |
| 10 |
| 5 |
| 10 |
| 4 |
| 10 |
点评:本题考查了有理数大小比较:正数大于0,负数小于0;负数的绝对值越大,这个数越小.
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