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中華民國國旗
Author:
侯杰材
GeoGebra
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直角坐標平面上的旋轉變換
異分母分數減法
兩位數除以一位數（一）
兩組對邊相等的四邊形
兩組對邊相等和有直角的四邊形
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Section Curves (2)
[問題] a² + b² = 1, (c-4)² + (d-2)² = 5，求 ad - bc 最大值？
Copy of 齊來製作對稱圖
雪花的碎形規律
常见四边形是否是双心四边形
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Expected Value
Means
Parallelogram
Complex Numbers
Fractions