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过圆上一点作切线，三步
Author:
u.jianwang
GeoGebra
New Resources
四邉形 (四年級) 教師版
判斷球體
錐體建築師
兩組對邊相等的四邊形
兩位數除以一位數（一）
Discover Resources
切割正二十面體(直)
PTCCS2new2
no10
三年級除法(一)：一位數除兩位數
圆的有关概念
Discover Topics
Sphere
Vectors 2D (Two-Dimensional)
Mode
Percentages
Hypergeometric Distribution