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try(7) 用外積判定轉向和phase的正負
Author:
WC
GeoGebra
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兩位數除以一位數（二）
兩組對邊相等和有直角的四邊形
拼砌四邊形
直角坐標平面上的旋轉變換
柱體建築師
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四下_認識小數(學生版)
測試
等分例子
正四角錐
分數與百分數的分別
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Statistical Characteristics
Secant Line or Secant
Centroid or Barycenter
Median Line
Binomial Distribution