请问这个圆锥曲线难题有什么射影几何背景吗 知乎 Template




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Try and sketch some of thesePoltergeist, Soda, X-ray, Key, Grog, Triplets, Sword swallower, Corset, Tourist, Zephyr, view more ideas


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tomski请问这个圆锥曲线难题有什么射影几何背景吗 知乎 coloring