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1977北京理11（2）
Author:
常振虎
GeoGebra
New Resources
畫出對稱圖形
錐體建築師
四邊形的特性
找出對稱軸
三位數除以一位數（一）
Discover Resources
弦的定理
soccer(final)
空間中正立方體
滾球平台
Similar Figures (QMSS)
Discover Topics
Reflection
Linear Equations
Rhombus
Cosine
Pythagoras or Pythagorean Theorem