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GeoGebra
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球体的体积推导（优化版）
異分母分數減法
拼砌四邊形
判斷球體
兩組對邊相等和有直角的四邊形
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柯西不等式 (2)
semops_錐體
動畫初階練習1(平移)
梯形的高
学习 GeoGebra 3D 计算器
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Geometric Transformations
Congruence
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Plane Figures or Shapes
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