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luodeqin@keleshuxue.com
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畫出對稱圖形
第八周作业
柱體建築師
異分母分數減法
三位數除以一位數（一）
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任務3
HKMO 2008 Question 3 Demonstration (Geometric Construction)
椭圆的定义
等分圓製作
새로운 양식
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Conic Sections
Quadratic Functions
Parallelogram
Vectors 2D (Two-Dimensional)
Vectors 3D (Three-Dimensional)