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正12面體
Author:
GEOGEBRA啟
GeoGebra
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球体的体积推导
拼砌四邊形
球体的体积推导（优化版）
異分母分數減法
【案例】2018年全国1卷理科12题
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多邊形的切割與拼砌
二次函數的圖形
花瓶
三角形內角和180度
伽利略比值II (Alfinio Flores & Hugh A. Sanders)
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Quadratic Functions
Numbers
Inequalities
Multiplication
Limits