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正方形
Author:
何嘉驹
GeoGebra
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平行線的判定
双心四边形
第三周作业效果演示
直線的斜率：水平變化 & 鉛垂變化
第八周作业1
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九點圓定理
ex 7
中點_圓_多邊形_軌跡
找规律（数阵与点阵）
Copy of Mjerenje obujma 5
Discover Topics
Linear Equations
Geometry
Derivative
Perimeter
Sphere