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Author:
Jianqiang He
GeoGebra
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兩組對邊相等的四邊形
錐體建築師
柱體建築師
三位數除以一位數（一）
第八周作业
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練習 - 反射對稱
Circumcentre
F2_Ch11.1_三角學(對鄰斜)
三角比的性質
遊戲
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Secant Line or Secant
Normal Distribution
Kite
Expected Value
Conditional Probability