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hbghlyj 发表于 2024-3-1 17:44 $p,e$為定值。 $r_1= p/(1-e\cos \theta_1)$ $r_2= p/(1-e\cos \theta_2)$
青青子衿 发表于 2024-3-1 18:07 bbs.emath.ac.cn/data/attachment/forum/201702/10/005039ud83tou5tonwp7xp.gif
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