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內公切線段長求法
Author:
謝易達
GeoGebra
New Resources
找出對稱軸
球體建築師
畫出對稱圖形
小数 的副本
第八周作业
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正八面體
題七
[問題] a² + b² = 1, (c-4)² + (d-2)² = 5，求 ad - bc 最大值？
Find your perfect rectangle
两个等腰三角形
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Fractal Geometry
Arithmetic
Tangent Line or Tangent
Logic
Conditional Probability