| 2 |
| 3 |
| 2 |
| 15 |
| 2 |
| 35 |
| 2 |
| 63 |
| 2 |
| 99 |
| 1 |
| 11 |
=
| 2 |
| 1×3 |
| 2 |
| 3×5 |
| 2 |
| 5×7 |
| 2 |
| 7×9 |
| 2 |
| 9×11 |
| 1 |
| 11 |
=1-
| 1 |
| 3 |
| 1 |
| 3 |
| 1 |
| 5 |
| 1 |
| 5 |
| 1 |
| 7 |
| 1 |
| 7 |
| 1 |
| 9 |
| 1 |
| 9 |
| 1 |
| 11 |
| 1 |
| 11 |
=1．
2/3+2/15+2/35+2/63+2/99+1/11．
| 2 |
| 3 |
| 2 |
| 15 |
| 2 |
| 35 |
| 2 |
| 63 |
| 2 |
| 99 |
| 1 |
| 11 |
数学人气：150 ℃时间：2020-03-20 06:00:19
优质解答
=
=1-
=1．
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