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相似三角形的性质
Author:
周胜华
GeoGebra
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拼砌四邊形
畫出對稱圖形
兩組對邊相等的四邊形
【案例】2018年全国1卷理科12题
球体的体积推导（优化版）
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思考題
Copy of 分數比較
兩直線的銳夾角
勾股定理：射影无字证明
平行線的斜率
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Linear Equations
Limits
Equations
Kite
Variance