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三角形性質--大角對大邊、小角對小邊
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GeoGebra
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兩組對邊相等的四邊形
兩位數加法
三位數除以一位數（二）
GeoGebra笔记功能体验课件
兩組對邊相等和有直角的四邊形
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How to reconstruct a quadrilateral farm to a triangular one with the same area?
圓與正三角形上動點連線上中點的軌跡
題二
勝者即正義，可愛即正義～(可用Ctrl+滑鼠滾輪放大界面)
用平方差公式做因式分解
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Parametric Curves
Real Numbers
Median Line
Sphere
Tree Diagrams