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Author:
李春培
I love you
GeoGebra
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柱體建築師
異分母分數減法
兩組對邊相等和有直角的四邊形
找出對稱軸
兩位數除以一位數（二）
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三角函數 Tan x 函數圖形
分數(約分)
GGB6
外心
劉虹圻 垂心
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Conic Sections
Translation
Polygons
Constructions
Integral Calculus