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Author:
Patrick Huang
GeoGebra
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兩位數加法
兩位數除以一位數（二）
三位數除以一位數（二）
畫出對稱圖形
兩組對邊相等和有直角的四邊形
Discover Resources
正弦定理
分數加減
滑桿動畫
日照图
正立方體展開圖
Discover Topics
Equilateral Triangles
Linear Programming or Linear Optimization
Tangent Line or Tangent
Geometric Mean
Rhombus