送交者: HunHunSheng 于 2009-03-12, 14:44:58:

回答: e^2=a^2-b^2 is not an asumption, it is derived from 椭圆是到固 定两点之和 由 chouqilozi 于 2009-03-12, 14:38:45:

• here - chouqilozi (357 bytes) 2009-03-12, 14:53:19 (305841)
  • the triangle is messed up. when the point is in the middle of the two focal - chouqilozi (64 bytes) 2009-03-12, 14:56:14 (305847)
  • 最后两行假设了对称性。 可是你凭什么可以假设对称？ (无内容) - HunHunSheng (0 bytes) 2009-03-12, 14:55:35 (305846)
    • Didn't assume, because - chouqilozi (108 bytes) 2009-03-12, 14:58:15 (305851)
      • 那你怎么知道轨迹会和两个焦点在一条直线上？ (无内容) - HunHunSheng (0 bytes) 2009-03-12, 15:12:48 (305860)
        • 昏君you lost me. (无内容) - chouqilozi (0 bytes) 2009-03-12, 15:18:59 (305874)

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