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椭圆的定义
Author:
guomenglin
Topic:
Ellipse
GeoGebra
New Resources
拼砌四邊形
第八周作业
錐體建築師
球体的体积推导（优化版）
兩組對邊相等和有直角的四邊形
Discover Resources
用 Geogebra 模擬日照、影長變換
三角函數
圓與三角形中點的軌跡
上課用
Copy of 盒子的體積
Discover Topics
Interest Calculation
Derivative
Sine
Hyperbola
Equilateral Triangles