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圆锥曲线的统一定义（第二定义）
Author:
少平 朱
GeoGebra
New Resources
兩位數加法
四邉形 (四年級) 教師版
畫出對稱圖形
球体的体积推导（优化版）
拼砌四邊形
Discover Resources
Angry Bird
Quiz on Angles in a Circle 圓內的角：測驗
gjzbh 矩陣與遞迴關係（3階）
重心
Illusion-外凸的正方形
Discover Topics
Quadrilaterals
Ellipse
Terms
Constructions
Pythagoras or Pythagorean Theorem