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双镜面反射问题

Author:孟宝兴

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第八周作业
兩組對邊相等的四邊形
【案例】2018年全国1卷理科12题
四邉形 (四年級) 教師版
拼砌四邊形

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柏拉圖多面體 Platonic Solids
Symmetric設計對稱圖案(一條對稱軸)斜2
內心與角平分線觀察
二次函数与一元二次方程和一元二次不等式
Properties of a Rectangle

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Differential Equation
Distributions
Incircle or Inscribed Circle
Integers
Similar Triangles

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