题目内容
| 1 |
| 1×3 |
| 1 |
| 3×5 |
| 1 |
| 5×7 |
| 1 |
| 17×19 |
| 1 |
| 19×21 |
| 1 |
| 1×3 |
| 1 |
| 3×5 |
| 1 |
| 5×7 |
| 1 |
| 17×19 |
| 1 |
| 19×21 |
=(
| 1 |
| 1 |
| 1 |
| 3 |
| 1 |
| 3 |
| 1 |
| 5 |
| 1 |
| 5 |
| 1 |
| 7 |
| 1 |
| 17 |
| 1 |
| 19 |
| 1 |
| 19 |
| 1 |
| 21 |
| 1 |
| 2 |
=(1-
| 1 |
| 7 |
| 1 |
| 17 |
| 1 |
| 21 |
| 1 |
| 2 |
=(
| 17 |
| 21 |
| 1 |
| 17 |
| 1 |
| 2 |
=
| 310 |
| 357 |
| 1 |
| 2 |
=
| 155 |
| 357 |
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题目内容
| 1 |
| 1×3 |
| 1 |
| 3×5 |
| 1 |
| 5×7 |
| 1 |
| 17×19 |
| 1 |
| 19×21 |
| 1 |
| 1×3 |
| 1 |
| 3×5 |
| 1 |
| 5×7 |
| 1 |
| 17×19 |
| 1 |
| 19×21 |
| 1 |
| 1 |
| 1 |
| 3 |
| 1 |
| 3 |
| 1 |
| 5 |
| 1 |
| 5 |
| 1 |
| 7 |
| 1 |
| 17 |
| 1 |
| 19 |
| 1 |
| 19 |
| 1 |
| 21 |
| 1 |
| 2 |
| 1 |
| 7 |
| 1 |
| 17 |
| 1 |
| 21 |
| 1 |
| 2 |
| 17 |
| 21 |
| 1 |
| 17 |
| 1 |
| 2 |
| 310 |
| 357 |
| 1 |
| 2 |
| 155 |
| 357 |