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轨迹2016.4.16
Author:
DongHai Zhang
三角形内心
GeoGebra
New Resources
三位數除以一位數（一）
画直线等分三角形的面积
找出對稱軸
兩組對邊相等和有直角的四邊形
判斷球體
Discover Resources
拋物線軌跡圖
周界-平移法(教學練習一)
行星運動
圓內接四邊形任務二：提示一
老師講解6
Discover Topics
Surface
Boxplot
Rhombus
Stochastic Process or Random Process
Logarithm