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橢圓之極偶 / polarity for ellipse
Author:
XIE Yuheng
GeoGebra
New Resources
四邊形的特性
兩組對邊相等的四邊形
四邉形 (四年級) 教師版
拼砌四邊形
三位數除以一位數（二）
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Modular Surface：1 / (1 + z²)