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海龍公式與內切圓半徑
Author:
李春培
三角形面積海龍公式與內切圓半徑
GeoGebra
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球體建築師
兩位數加法
兩位數除以一位數（二）
找出對稱軸
兩組對邊相等的四邊形
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Spotlight 探射燈
p11-10
P53_3a
讀量杯上的刻度 (練習)
四邊形的特性
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Similar Triangles
Differential Equation
Parametric Curves
Tree Diagrams
Histogram