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Author:
Lin Ching Chieh
GeoGebra
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畫出對稱圖形
兩組對邊相等和有直角的四邊形
GeoGebra笔记功能体验课件
小数 的副本
四邊形的特性
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fhft
二階行列式-平行四邊形的面積
橢圓P176例11
圆锥曲线的统一定义（第二定义）
古典概型
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Functions
Natural Numbers
Linear Equations
Secant Line or Secant
Sphere