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二元二次方程（二次曲线）
Author:
ericlee
GeoGebra
New Resources
圓的基本性質
双心四边形
垂直線的斜率
圓的切線方程
斜率的值
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Mobius 變換
Summary
認識線型函數關係式與圖形
Copy of 劉徽的「割圓術」
圓冪性質
Discover Topics
Cylinder
Inequalities
Fractions
Straight Lines
Geometric Transformations