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探索三角形SAS全等性質
Author:
Gideon Huang
GeoGebra
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兩位數加法
拼砌四邊形
【案例】2018年全国1卷理科12题
三位數除以一位數（二）
畫出對稱圖形
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lim sin(x)/x = 1
利用对称求线段和最值
五位數
認識分數
【高中物理】圆锥摆
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Rectangle
Exponent
Median Line
Hyperbola
Linear Programming or Linear Optimization