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錯角---垂直平行綫
Author:
chanfushun
GeoGebra
New Resources
判斷球體
球体的体积推导
三位數除以一位數（二）
【案例】2013年安徽高考15题
画直线等分三角形的面积
Discover Resources
圓圈圈
象限
勒洛三角形(方型鑽子模型)
活化斥引力 能 夫婦 給 蓄影
拋物線6--包絡線法
Discover Topics
Upper and Lower Sum or Riemann Sum
Statistical Characteristics
Pie Chart or Circle Chart
Rectangle
Random Experiments