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Author:
许业成
GeoGebra
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龙形曲线-分形龙2
正方形雪花图案
中华人民共和国国旗
盈利與虧蝕
百分數及其應用
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旋轉體：Washer Method
加法
How to draw a heptagon with ruler andcomp…
包含除法（1 ÷分數）
圓的面積的副本
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Incircle or Inscribed Circle
Area
Sine
Equations
Ellipse