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多普勒效应动态演示
Author:
孟宝兴
GeoGebra
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兩位數除以一位數（一）
兩組對邊相等和有直角的四邊形
錐體建築師
畫出對稱圖形
GeoGebra笔记功能体验课件
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proof10 曹詠鈞
複合圖形(二)
進出刀量測-圓形
四年級面積的量度
題四
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Orthocenter
Complex Numbers
Equations
Trigonometry
Logic