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Triangle fixed height
Author:
iedc
GeoGebra
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画直线等分三角形的面积
兩位數除以一位數（二）
【案例】2013年安徽高考15题
兩位數加法
兩組對邊相等的四邊形
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我的解法
類尺規作圖
愛上貝氏曲線 (Love for Bezier)
面外一點
椭圆的两条垂直切线的交点轨迹 蒙日圆
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Random Experiments
Polynomial Functions
Hyperbola
Linear Programming or Linear Optimization
Curve Sketching