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正方形與菱形
Author:
s1002978
GeoGebra
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三位數除以一位數（二）
兩組對邊相等和有直角的四邊形
兩組對邊相等的四邊形
錐體建築師
【案例】2013年安徽高考15题
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負二項分佈
平行四邊形中點連線及分角線交點連線形狀
三角形内角和，演示
畢氏定理3
角平分線作圖1213
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Sequences and Series
General Quadrilateral
Normal Distribution
Similarity Transformation or Similarity
Hyperbola