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概率与频率关系
Author:
朱亮
GeoGebra
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三位數除以一位數（一）
異分母分數減法
GeoGebra笔记功能体验课件
兩組對邊相等和有直角的四邊形
兩位數除以一位數（一）
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圓點線
線性代數
定周长的正多边形面积变化规律
柱體＿
圆锥曲线
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Geometry
Plane Figures or Shapes
Dilation
Centroid or Barycenter
General Quadrilateral