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the definition of ellipse
Author:
丁明智
GeoGebra
New Resources
畫出對稱圖形
球體建築師
找出對稱軸
兩位數除以一位數（一）
兩組對邊相等和有直角的四邊形
Discover Resources
Reflection 反射變換
表示數線上的位置
四次函數
example 1_sun
學習活動五之二在解區域中由平行線法找出極值解的可能位置
Discover Topics
Step Functions
Median Line
Geometric Distribution
Similarity Transformation or Similarity
Complex Numbers