在百数表的[ ]中填数。
| 1 |
2 |
3 |
4 |
5 |
6 |
7 |
8 |
9 |
10 |
| 11 |
|
|
|
|
|
|
|
|
|
| 21 |
|
23 |
（ ） |
|
|
|
|
|
|
| 31 |
|
|
|
|
36 |
（ ） |
|
|
|
| 41 |
|
|
|
|
|
|
|
|
|
| 51 |
|
|
|
55 |
|
57 |
( ) |
|
|
| 61 |
|
|
|
|
|
|
|
|
( ) |
| 71 |
|
|
|
|
( ) |
|
|
|
|
| 81 |
|
|
|
|
|
|
( ) |
|
|
| 91 |
|
|
|
|
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|
含有 个
，去掉 个
的分数单位是 ，增加 个这样的分数单位后就是2．
． ．