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練習 - 逆時針旋轉（三角形）
Author:
Lau Sir
Topic:
Triangles
GeoGebra
New Resources
算柱 (兩位數)
【案例】2013年安徽高考15题
異分母分數減法
判斷球體
兩位數除以一位數（一）
Discover Resources
周界
花瓶
圓方程式
拋物線2--焦點法
海宇的第一个GGB绘本
Discover Topics
Root
Tangent Line or Tangent
Geometry
Rectangle
Vectors 3D (Three-Dimensional)