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Shtepi(Vendi Baze)
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Elementary school math
Author:
呂宗錡
Drag E and F to rotate the rectangle RSTU.
GeoGebra
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双心四边形
圓的基本性質
常见四边形是否是双心四边形
漂亮的摇摆曲线
直線的斜率
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testing
Prism and Cylinder 5
一元二次不等式
vector
Copy of 閱讀鐘面及數字鐘（時和分）