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硬币
Author:
luodeqin@keleshuxue.com
GeoGebra
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算柱 (兩位數)
【案例】2013年安徽高考15题
畫出對稱圖形
兩位數除以一位數（一）
兩位數加法
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三角形3,4,5
千年曆2
Copy of 固定周界的長方形的面積變化
test22
黃金三角形
Discover Topics
Standard Deviation
Similarity Transformation or Similarity
Conditional Probability
Coordinates
Set Theory