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圓錐體內切球
Author:
徐峻彥
GeoGebra
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GeoGebra笔记功能体验课件
三位數除以一位數（二）
兩位數加法
畫出對稱圖形
四邊形的特性
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happy new year
parallelgram with height 20120319
ghseh 二次函數描點法上下平移-4
立體三角測量(例六)
导数
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Derivative
Conditional Probability
Ellipse
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