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例1（1）
Author:
杜耀宗
GeoGebra
New Resources
兩位數加法
sanjiaohanshu
判斷球體
柱體建築師
兩位數除以一位數（二）
Discover Resources
Add and subtract (binary)
正12面體內接正四面體
錯角---水平平行綫
sintx
平移中心
Discover Topics
Planes
Orthocenter
Constructions
Percentages
Set Theory