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公切線的條數
Author:
李春培
公切線的條數
GeoGebra
New Resources
算柱 (兩位數)
三位數除以一位數（二）
兩位數加法
找出對稱軸
拼砌四邊形
Discover Resources
中點軌跡(動點在兩圓上)
密鋪4
國旗
N-ellipse
江苏省对口单招2015年高考数学卷 立体几何
Discover Topics
Trigonometry
Right Triangles
Calculus
Linear Programming or Linear Optimization
Normal Distribution