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符成岗
Author:
符成岗
GeoGebra
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兩位數加法
直角坐標平面上的旋轉變換
找出對稱軸
球體建築師
兩位數除以一位數（二）
Discover Resources
YH的GGB_BOOK
三心：與三角形形狀的關係
高次不等式
線性組合的副本
三视图
Discover Topics
Centroid or Barycenter
Multiplication
Vectors 2D (Two-Dimensional)
Isosceles Triangles
Median Line