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gjc102a14 三角形內的高
Author:
均一
GeoGebra
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球体的体积推导（优化版）
拼砌四邊形
【案例】2018年全国1卷理科12题
四邉形 (四年級) 教師版
判斷球體
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Time
橢圓軌跡
课题
Triangle (Angle)
Trianglar prism
Discover Topics
Conic Sections
Square
Equations
Probability
Cuboid