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angles sum on a striaght line
Author:
LAM YU SANG
GeoGebra
New Resources
兩位數加法
直線的斜率
兩位數除以一位數（二）
画直线等分三角形的面积
【案例】2013年安徽高考15题
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正三角形內部一點
面、面相交
curve 函數的示範
軌跡觀察
對稱成分(零序.正序.負序)
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Power Functions
Scatter Plot
Centroid or Barycenter
Orthocenter
Trigonometry