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抛物线定义
Author:
蔡永志
抛物线定义
GeoGebra
New Resources
画直线等分三角形的面积
判斷球體
兩位數除以一位數（一）
【案例】2013年安徽高考15题
找出對稱軸
Discover Resources
Constructing Quadrilaterals by Four Sides (2014)
軌跡
過圓內一點與圓相切的圓
複合圖形表面積(一)
sample mean T test
Discover Topics
Ellipse
Reflection
Constructions
Cosine
Quadrilaterals