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正三角形堆垛
Author:
施奕瑄
GeoGebra
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【案例】2018年全国1卷理科12题
兩位數除以一位數（一）
兩組對邊相等和有直角的四邊形
找出對稱軸
畫出對稱圖形
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點之極線定理 / polar of a point theorem
我的第一個GGB動畫
翰林B4講p192_類1
行星軌跡
elevation
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Inequalities
Rational Numbers
Matrices
Constructions
Equations