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Author:
陈铁成
GeoGebra
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兩組對邊相等的四邊形
兩位數除以一位數（二）
畫出對稱圖形
三位數除以一位數（二）
找出對稱軸
Discover Resources
Surface area of sphere
chapter1
證平行四邊形 (對角相等)
分段控制
放大／縮小 Resize
Discover Topics
Inequalities
Arithmetic Operations
Bar Chart or Bar Graph
Cone
Constructions