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同心圓+等分割線
Author:
許清惟
GeoGebra
New Resources
四邉形 (四年級) 教師版
兩組對邊相等的四邊形
第八周作业
兩位數除以一位數（一）
找出對稱軸
Discover Resources
習題0330-2017
勝者即正義，可愛即正義～(可用Ctrl+滑鼠滾輪放大界面)
包絡線：拋物線
y=-3x+6(x>=3)
旋转多边形
Discover Topics
Planes
Plane Figures or Shapes
Subtraction
Complex Numbers
Symmetry