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錯角---垂直平行綫
Author:
chanfushun
GeoGebra
New Resources
兩組對邊相等的四邊形
找出對稱軸
画直线等分三角形的面积
【案例】2013年安徽高考15题
球體建築師
Discover Resources
相切的三圓
大斜方
GGB11
鏡射的副本
连续开方（制作：谢建华，修订：孟宝兴）
Discover Topics
Difference and Slope
Surface
Functions
Geometry
Exponential Functions