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两平面夹角
Author:
刘莹
GeoGebra
New Resources
直角坐標平面上的旋轉變換
兩位數除以一位數（二）
兩位數加法
畫出對稱圖形
算柱 (兩位數)
Discover Resources
angle0428
角速度概念
拿破侖定理(內拿破侖)證明三
鉛筆畫圓
Copy of 二次函數圖形
Discover Topics
Perimeter
Piecewise Functions
Continuity
Secant Line or Secant
Stochastic Process or Random Process