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Author:
吳秉沂
GeoGebra
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拼砌四邊形
三位數除以一位數（二）
三位數除以一位數（一）
【案例】2013年安徽高考15题
柱體建築師
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conjugate
求三棱锥体积
任意角的三角函数
单晨制作网板网板甘肃刘玉平供题
Copy of 數線的繪製
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Centroid or Barycenter
Natural Numbers
Angles
Difference and Slope
Statistical Characteristics