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二次函数y=ax²(a<0)
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月如
GeoGebra
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【案例】2013年安徽高考15题
垂直線的斜率
漂亮的摇摆曲线
祖冲之的期望:内棋与外棋
【案例】圆柱体内放置一个大球六个小球
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給三角形求正三角形
溫室設計圖
周界
包絡線
學習活動一解的意義
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Quadratic Functions
Trigonometric Functions
Similarity Transformation or Similarity
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Straight Lines