题目内容
| 18 |
| 19 |
| 198 |
| 199 |
| 1989 |
| 1990 |
| 1989 |
| 1990 |
| 1989 |
| 1990 |
| 18 |
| 19 |
| 18 |
| 19 |
分析:分别用1减去各分数,得出的结果越小,则原数越大,据此解答.
解答:解:1-
=
,
1-
=
,
1-
=
,
因为
>
>
,
所以
<
<
.
因此这三个数中,
最大,
最小.
故答案为:
,
.
| 18 |
| 19 |
| 1 |
| 19 |
1-
| 198 |
| 199 |
| 1 |
| 199 |
1-
| 1989 |
| 1990 |
| 1 |
| 1990 |
因为
| 1 |
| 19 |
| 1 |
| 199 |
| 1 |
| 1990 |
所以
| 18 |
| 19 |
| 198 |
| 199 |
| 1989 |
| 1990 |
因此这三个数中,
| 1989 |
| 1990 |
| 18 |
| 19 |
故答案为:
| 1989 |
| 1990 |
| 18 |
| 19 |
点评:分数比较大小,有多种方法,此题也可这样解答:
+
=1,
+
=1,
+
=1,显然有
>
>
,故
<
<
.
| 18 |
| 19 |
| 1 |
| 19 |
| 198 |
| 199 |
| 1 |
| 199 |
| 1989 |
| 1990 |
| 1 |
| 1990 |
| 1 |
| 19 |
| 1 |
| 199 |
| 1 |
| 1990 |
| 18 |
| 19 |
| 198 |
| 199 |
| 1989 |
| 1990 |
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