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Pappus古定理證明
Author:
連琨銘
GeoGebra
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兩位數除以一位數（二）
異分母分數減法
畫出對稱圖形
四邉形 (四年級) 教師版
柱體建築師
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縫衣針
動圓定圓兩圓內切動圓圓心軌跡
圓周率的應用 題1
极坐标系
兩圓位置關係
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Tree Diagrams
Addition
Triangles
Rhombus
Curve Sketching