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等腰，角度关系
Author:
pjcfs
GeoGebra
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兩組對邊相等和有直角的四邊形
近似值：有效數字
畫出對稱圖形
美國國旗 (Codex 版)
找出對稱軸
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任務4
圓外切四邊形對邊和等長
proof25陳佑豪
空間向量
初中函数
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Geometry
Complex Numbers
Vectors
Straight Lines
Random Variables