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Author:
chen mingchuan
GeoGebra
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拼砌四邊形
兩位數加法
【案例】圆柱体内放置一个大球六个小球
異分母分數減法
三位數除以一位數（一）
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三角形全等的理由 – 題3
Apollonius Problem 10 CCC wiki step 3
GGB研習成果01
一线三等角模型
烟囱
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Geometric Transformations
Division
Orthocenter
Root
Equilateral Triangles