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禪繞畫1
Author:
s1131018
GeoGebra
New Resources
垂直線的斜率
祖冲之的期望：内棋与外棋
直線的斜率
撒针估算面积实验
盈利與虧蝕
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大邊對大角
圆锥曲线定义的拓展（卡西尼卵形线）
taeyeon
橢圓折痕
椭圆中的对称斜率为定值问题20190917
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Functions
Differential Equation
Similar Triangles
Quadratic Functions
Vectors 3D (Three-Dimensional)