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高尔顿板实验
Author:
张志勇
GeoGebra
New Resources
讀磅
平行線的斜率
球体的体积推导（优化版）
圓的切線方程
祖冲之的期望：内棋与外棋
Discover Resources
初三作业
不規則圖形的周界(凹)
選修數學
二重积分的计算-截面法求体积
奥倍尔定理
Discover Topics
Equilateral Triangles
Calculus
Ratios
Incircle or Inscribed Circle
Complex Numbers