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正方形與菱形
Author:
s1002978
GeoGebra
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【案例】2018年全国1卷理科12题
兩組對邊相等的四邊形
兩位數除以一位數（一）
【案例】圆柱体内放置一个大球六个小球
畫出對稱圖形
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四邊形四個西姆松圓交於九點心
聖者即正義
進步公式
gjc090b13 二次函數的平移
达芬奇椭圆仪
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Orthocenter
Polynomial Functions
Equations
Angles
Linear Programming or Linear Optimization