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quadrilaterals 3
Author:
iedc
GeoGebra
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判斷球體
拼砌四邊形
三位數除以一位數（一）
找出對稱軸
兩位數除以一位數（二）
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向量座標
straight line
Copy of 固定周界的長方形的面積變化
二元线性规划的图解法(习题3)
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Constructions
Boxplot
Planes
Conic Sections
Difference and Slope