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教学素材：离心率相同的椭圆
Author:
清风拂琴，陌上花开
GeoGebra
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Nested spiral octagon
湖南省张毅郴数字教研工作室 logo
直角坐標平面上的旋轉變換
長方體平面投影 (Codex版)
近似值：有效數字
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帕普斯定理：齊次座標
任意三角形
椭圆的定义
C60足球模型（序列+旋转）
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Real Numbers
Limits
Numbers
Frequency Distribution
Parallelogram