| 1 |
| 21 |
| 202 |
| 2121 |
| 50505 |
| 212121 |
| 13131313 |
| 21212121 |
=
| 1 |
| 21 |
| 202 |
| 21×101 |
| 50505 |
| 21×10101 |
| 13131313 |
| 21×1010101 |
=
| 1 |
| 21 |
| 2×101 |
| 21×101 |
| 5×10101 |
| 21×10101 |
| 13×1010101 |
| 21×1010101 |
=
| 1 |
| 21 |
| 2 |
| 21 |
| 5 |
| 21 |
| 13 |
| 21 |
=
| 21 |
| 21 |
=1．
1/21+202/2121+50505/212121+13131313/21212121=_．
| 1 |
| 21 |
| 202 |
| 2121 |
| 50505 |
| 212121 |
| 13131313 |
| 21212121 |
数学人气：535 ℃时间：2020-06-04 16:53:57
优质解答
=
=
=
=
=1．
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