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邊長與三角形（一） 的複本
Author:
Tony Cheng
,
GeoGebra Institute of Hong Kong
GeoGebra
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四邊形的特性
兩位數除以一位數（一）
球体的体积推导
兩位數除以一位數（二）
異分母分數減法
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特殊線.ggb
proof50 劉邦佑
切線性質
三垂線定理
二次函数y=ax²（a＞0)
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Rectangle
Vectors
Sequences and Series
Hypergeometric Distribution
Equilateral Triangles