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[几何] 立体几何

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hjfmhh posted 2023-4-9 19:45 |Read mode

5{077UTBHRDQ1CSA[2]1ODA.png

选项BCD怎么理解

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hejoseph posted 2023-4-10 08:50

平面的法向量看成直线，就变成选项A的解法了

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kuing posted 2023-4-19 16:32

画圆锥看交线，像 forum.php?mod=viewthread&tid=4636

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