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三角形三边关系
Author:
周艳玲
GeoGebra
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平行線的斜率
漂亮的摇摆曲线
画直线等分三角形的面积
兩位數加法
祖冲之的期望：内棋与外棋
Discover Resources
球內接正方體
三角函數伸縮與平移
圓點線
单晨制作水箱侧翻通用模型
Quiz on Addition and Subtraction of Directed Numbers (2)
Discover Topics
Incircle or Inscribed Circle
Arithmetic
Geometric Transformations
Fractal Geometry
Quadratic Equations