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老皮

Author:alina0217

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拼砌四邊形
画直线等分三角形的面积
畫出對稱圖形
【案例】2018年全国1卷理科12题
兩位數加法

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圓與弦2
和差角公式几何证明
垂直3
橢圓1-同心圓法
根據百分率找數量（一）: 例2的副本

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Circle
Power Functions
Parametric Curves
Rectangle
Area

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