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三角形
Author:
vincent21891
Topic:
Triangles
GeoGebra
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算柱 (兩位數)
三位數除以一位數（二）
兩組對邊相等和有直角的四邊形
畫出對稱圖形
柱體建築師
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正多面體
求 a + b 的最大值？
三角形
Dart Board
Illusion-若隐若现的白点
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Calculus
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