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Apollonius Problem gergonne 1
Author:
tkyggb
GeoGebra
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異分母分數減法
兩組對邊相等和有直角的四邊形
兩位數除以一位數（一）
畫出對稱圖形
球体的体积推导
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線之極點定理 / pole of a line theorem
正弦定理
Boxes
國旗會動
進步公式
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Kite
Tree Diagrams
Rhombus
Geometric Transformations
Integers