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線性變換矩陣（二階）的副本
Author:
xiaodandan
,
arist
GeoGebra
New Resources
兩組對邊相等和有直角的四邊形
找出對稱軸
四邉形 (四年級) 教師版
sanjiaohanshu
算柱 (兩位數)
Discover Resources
waaachen
waaachen
第一階段：二次函數恆正恆負條件，完成後往下至下一階段
線的面化
游戏
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Conic Sections
Hypergeometric Distribution
Curve Sketching
Cylinder
Reflection