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第一课：立体几何中的“平面”到底是什么？
2026-09-02
网络整理
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Key Point:从平面几何进入立体几何，高一学生首先需要理解的一个核心概念便是“平面”。如果说平面几何研究的是“一张纸”上的图形，那么立体几何研究的就是“整个空间”中的图形。而平面
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2026-09-02
网络整理佚名950
