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向量相加
Author:
林俊志
GeoGebra
New Resources
算柱 (兩位數)
兩組對邊相等的四邊形
球體建築師
球体的体积推导（优化版）
第八周作业
Discover Resources
橢圓軌跡 (3)
有向數
正六角錐(旋轉，實體、透視)
試算表應用
外心
Discover Topics
Centroid or Barycenter
Logarithm
Square
Statistics
Tangent Function