| 3 |
| 8 |
| 16 |
| 25 |
| 3 |
| 8 |
| 16 |
| 25 |
=7
| 3 |
| 8 |
| 9 |
| 25 |
| 5 |
| 8 |
| 16 |
| 25 |
=（7
| 3 |
| 8 |
| 5 |
| 8 |
| 9 |
| 25 |
| 16 |
| 25 |
=13-9，
=4．
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