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GGB4
Author:
王博賢
GeoGebra
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四邊形的特性
異分母分數減法
錐體建築師
判斷球體
球体的体积推导（优化版）
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parallelgram with height 20120319
分數加減
simulation of the uniform variable linear motion
Question 2
同位角---不平行綫
Discover Topics
Constructions
Vectors 2D (Two-Dimensional)
Linear Regression
Continuity
General Quadrilateral