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Author:
夜雨嘀嗒
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三位數除以一位數（二）
找出對稱軸
兩位數加法
畫出對稱圖形
【案例】2018年全国1卷理科12题
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三角形重心(相關說明)
Klein Bottle
Proof of Pythagorean Theorem with Shearing
孟氏定理 (Menelaus' theorem)
直角坐标系
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Differential Calculus
Derivative
Statistics
Conic Sections
Area