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欧拉线与九点圆

Author:吕胜

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三位數除以一位數（二）
拼砌四邊形
畫出對稱圖形
找出對稱軸
兩組對邊相等和有直角的四邊形

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三角形內切三圓
Rolling Square
算幾不等式
函数作图工具的副本
工作紙(1) 思考題

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General Quadrilateral
Unit Circle
Equations
Area
Quadratic Functions

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