| 1 |
| 1×5 |
| 1 |
| 5×9 |
| 1 |
| 9×13 |
| 1 |
| 13×17 |
| 1 |
| 17×21 |
=
| 1 |
| 4 |
| 1 |
| 5 |
| 1 |
| 5 |
| 1 |
| 9 |
| 1 |
| 9 |
| 1 |
| 13 |
| 1 |
| 13 |
| 1 |
| 17 |
| 1 |
| 17 |
| 1 |
| 21 |
=
| 1 |
| 4 |
| 1 |
| 21 |
=
| 1 |
| 4 |
| 20 |
| 21 |
=
| 5 |
| 21 |
1/1×5+1/5×9+1/9×13+1/13×17+1/17×21．
| 1 |
| 1×5 |
| 1 |
| 5×9 |
| 1 |
| 9×13 |
| 1 |
| 13×17 |
| 1 |
| 17×21 |
数学人气：458 ℃时间：2020-03-31 13:54:44
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