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soccer
Author:
kurt lan
soccer
GeoGebra
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錐體建築師
柱體建築師
兩位數加法
三位數除以一位數（一）
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指數函數圖形
三角形的內角和+內心與外心
軌跡觀察
有理数与无理数
GeoGebra合作伙伴关系
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Quadratic Equations
Pyramid
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