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切線段等長
Author:
謝易達
可移動P點，檢查切線段是否等長
GeoGebra
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錐體建築師
三位數除以一位數（二）
拼砌四邊形
算柱 (兩位數)
四邉形 (四年級) 教師版
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負二項分佈
proof92吳冠穎
test1(尋找北極星)
Apollonius Problem 4 LLP Homo 12
开关灯游戏 5×3
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Orthocenter
Planes
Quadratic Equations
Ratios
Linear Programming or Linear Optimization