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三角形四心
Author:
lamanleung
GeoGebra
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【案例】圆柱体内放置一个大球六个小球
四邉形 (四年級) 教師版
球體建築師
兩位數除以一位數（一）
畫出對稱圖形
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對數的遞增或遞減(底數大於1)
proof92吳冠穎
中華民國國旗
橢圓軌跡_過圓內一點與圓內切
平面向量基本定理
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Straight Lines
Differential Equation
Sphere
Congruence