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二次函数y=ax²（a＞0)
Author:
吕胜
GeoGebra
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兩組對邊相等和有直角的四邊形
兩組對邊相等的四邊形
四邊形的特性
畫出對稱圖形
找出對稱軸
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zztest
橢圓面積的計算
球體
雙曲線1 交點法
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Triangles
Quadrilaterals
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Similarity Transformation or Similarity
Continuity