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[問題] 以橢圓焦點為中心的正方形
Author:
羅驥韡 (Pegasus Roe)
Topic:
Ellipse
問:以橢圓焦點為中心的正方形,其頂點可能有幾個落在橢圓上? 答:0, 1, 2 提示:圖中的「紅點」與「黃色焦點」可以拉動。
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