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余弦定理的证明
Author:
john arnold
GeoGebra
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多邊形的面積
球体的体积推导（优化版）
直線的斜率
探究三角形的全等條件
球体的体积推导
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梭哈的機率
GeoGebra作圖─ＡＡＳ全等
Ex5C#10
GGB 案例分享
[洋葱] 与相似有关的最值问题-Q2
Discover Topics
Orthocenter
Differential Equation
Logic
Straight Lines
Circumcircle or Circumscribed Circle