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Tangent perpendicular to radius
Author:
Big Lee
GeoGebra
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兩位數加法
柱體建築師
畫出對稱圖形
【案例】2018年全国1卷理科12题
三位數除以一位數（一）
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橢圓軌跡(兩同心圓)102.12.04
微積分基本定理
Easter egg
equations of circle 1
拋物線2-焦點法
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Trigonometry
Square
Geometric Mean
Equations
Sequences and Series