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拿破侖定理(內拿破侖)證明三
Author:
連琨銘
GeoGebra
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兩組對邊相等的四邊形
三位數除以一位數（一）
兩位數除以一位數（二）
錐體建築師
畫出對稱圖形
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Angle between Two Planes 面面角
reflectional symmetry_5
图形动画3
双曲线第一定义
【案例】2018年全国1卷理科12题
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Linear Equations
Rhombus
Integral Calculus
Surface
Correlation