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三角形的內心軌跡
Author:
lunhsin
GeoGebra
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兩組對邊相等和有直角的四邊形
異分母分數減法
畫出對稱圖形
球体的体积推导（优化版）
找出對稱軸
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中考数学压轴题大放送之十四
proof*5 張華炘
o'clcok
gyzpa 拋物線焦點準線
Volumen ablesen 2
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Constructions
Equations
Means
Fractal Geometry
Similar Triangles