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圓錐截痕
Author:
洪宜慧
GeoGebra
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兩位數除以一位數（二）
兩位數加法
球體建築師
兩組對邊相等的四邊形
判斷球體
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平行線截等比例
龍騰4_1-1課例1
B小學今星期的遲到人數
prism
三角形重心
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Similar Triangles
Division
Centroid or Barycenter
Definite Integral
Prism