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Illusion-内凹的正方形
Author:
王彤
GeoGebra
New Resources
圓周公式的應用
三位數除以一位數（二）
平行線的斜率
三位數除以一位數（一）
兩位數加法
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空間三坐標平面101.12.22
廣義角的代換(180,360)
曲柄搖桿
孟氏定理 (Menelaus' theorem)
连杆
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Parametric Curves
Pie Chart or Circle Chart
Rotation
Means
Reflection