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20161029國旗
Author:
susan
GeoGebra
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画直线等分三角形的面积
兩組對邊相等和有直角的四邊形
兩組對邊相等的四邊形
三位數除以一位數（二）
兩位數加法
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優良作品5
Apollonius Problem 7 CCP Inversion simple 34
Parameter
正多面體
斜坐標
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Ellipse
Division
Special Points
Derivative
Complex Numbers