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長方形內兩線段和
Author:
Erix Chen
GeoGebra
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平行線的判定
第八周作业2
常见四边形是否是双心四边形
盈利與虧蝕
龙形曲线-分形龙2
Discover Resources
task 8
Locus教學
扇形:圖片與動畫使用
定周长的正多边形面积变化规律（含圆）
少了一個質數One less prime number
Discover Topics
Median Value
Statistics
Reflection
Centroid or Barycenter
Quadratic Equations