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dragon(龙)
Author:
赵林
GeoGebra
New Resources
異分母分數減法
找出對稱軸
三位數除以一位數（一）
四邉形 (四年級) 教師版
畫出對稱圖形
Discover Resources
柏拉圖多面體 Platonic Solids
極線獨立定理 / polar independence theorem
gyzpa 拋物面鏡的反射
tetrahedron_rotation
Graph of sine
Discover Topics
Numbers
Volume
Logic
Right Triangles
Circumcircle or Circumscribed Circle