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圆锥曲线的概念（完整版）
Author:
张志勇
Topic:
Conic Sections
GeoGebra
New Resources
球体的体积推导
畫出對稱圖形
兩位數除以一位數（一）
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
模版 - 無框黑板
切割線性質
翻轉方塊(雙開)
reflectional symmetry_6
拋物線軌跡
Discover Topics
Similar Triangles
Differential Equation
Parabola
Translation
Equations