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勾股定理证明
Author:
万超杰
GeoGebra
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兩組對邊相等的四邊形
兩位數加法
球体的体积推导
【案例】圆柱体内放置一个大球六个小球
異分母分數減法
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旋轉
正多邊形的對角線
兩向量的比
mooc第五讲作业单晨制作
探索勾股三元数
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Linear Equations
Hypergeometric Distribution
Equilateral Triangles
Cone
Natural Numbers