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二次函數
Author:
user9709
GeoGebra
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直線的斜率：水平變化 & 鉛垂變化
圓的基本性質
折扣
双心四边形
圓周公式的應用
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y=a(x-h)²+k
绘你妈本
圓周公式應用題1
三角形内切圆
繡曲線
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Means
Vectors
Circumcircle or Circumscribed Circle
Trigonometry
Equilateral Triangles