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Author:
雷雨Leo
GeoGebra
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錐體建築師
拼砌四邊形
兩位數除以一位數（二）
畫出對稱圖形
找出對稱軸
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大邊對大角
http://www.qsir.org/?p=8853
[問題] G1, G2, G3 為△ACG, △ABG, △BCG 的重心
Copy of 仙后座找北極星1
中國火柴遊戲二的副本
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Cube
Parametric Curves
Multiplication
Normal Distribution
Polynomial Functions