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轨迹2016.4.16
Author:
DongHai Zhang
三角形内心
GeoGebra
New Resources
拼砌四邊形
兩組對邊相等的四邊形
柱體建築師
球体的体积推导（优化版）
找出對稱軸
Discover Resources
Time
quadrilaterals 1
勝者即正義，可愛即正義～(可用Ctrl+滑鼠滾輪放大界面)
閱讀月曆
初中数学探究
Discover Topics
Confidence Interval
Root
Similarity Transformation or Similarity
Distributions
Ratios