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调和CrossRatio
Author:
代国兴 田立新
GeoGebra
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幾何作圖題：切三圓（題目）
美國國旗 (Codex, 2026.10.06)
中華民國國旗 (Codex╱2026.10.06)
Fibonacci Clock
畫出對稱圖形
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abcd
National_Flag
纏繞畫1
二項分佈的副本
圆周长演示
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Functions
Variance
Linear Programming or Linear Optimization
Cone
Linear Functions