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the definition of ellipse
Author:
丁明智
GeoGebra
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中华人民共和国国旗
撒针估算面积实验
平行線的判定
科赫雪花
直線的斜率：水平變化 & 鉛垂變化
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由組織圖到頻數多邊形
平行四邊形
a sin(bx+c) +d
線對稱圖形
Copy of 畫三角形 題1a
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Differential Calculus
Statistical Characteristics
Triangles
Diagrams
Circle