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劉虹圻 內心
Author:
呂麗珠
GeoGebra
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判斷球體
球体的体积推导
兩位數除以一位數（一）
四邊形的特性
四邉形 (四年級) 教師版
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猴子攀樹
How to reconstruct a quadrilateral farm to a triangular one with the same area?
外心的找法與特性
畢氏定理
橢圓軌跡
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Standard Deviation
Polynomial Functions
Isosceles Triangles
Stochastic Process or Random Process
Tangent Function