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同心圓

Author:施奕瑄

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近似值：有效數字
第八周作业
找出對稱軸
畫出對稱圖形
三位數除以一位數（一）

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echen say
阿基米德螺線
和直线和圆同时相切的圆
分数加法 Fraction Addition
折纸角度探究2

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Arithmetic Mean
Differential Equation
Piecewise Functions
Parabola
Square

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