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Author:
詠甯
GeoGebra
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判斷球體
球体的体积推导（优化版）
【案例】2013年安徽高考15题
異分母分數減法
畫出對稱圖形
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遞迴數列的星星
方格紙上畫正方形2
How to draw a triangle with ruler and compasses?
N-ellipse
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Discover Topics
Symmetry
Function Graph
Conic Sections
Parametric Curves
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