n分数近似值
- ------------------- ------------------
1 3/1 3
2 87/32 2.71875
3 878/323 2.7182662538699...
4 2721/1001 2.7182817182817...
5 49171/18089 2.7182818287356...
6 566827/208524 2.7182818284705...
7 9242691/3400196 2.7182818284593...
8 28245729/10391023 2.7182818284590...
...
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