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椭圆画法1--参数方程法
Author:
冯伟冀
GeoGebra
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双心四边形
盈利與虧蝕
龙形曲线-分形龙2
正方形雪花图案
直線的斜率：水平變化 & 鉛垂變化
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拋物線的光學性質
Rounding Quiz (Decimal Places) 小數位：測驗
ABC 3
线段-视觉差
双曲线的定义
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Ellipse
Equations
Probability
Percentages
Cone