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黎曼和
Author:
Hsuan
GeoGebra
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画直线等分三角形的面积
兩位數除以一位數（一）
兩組對邊相等的四邊形
兩位數加法
判斷球體
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相似三角形: 重溫
「相似三角形」任务4
鉛筆畫圓
a sin(bx+c) + d 的圖形的副本
matrix of rotation transformation
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Centroid or Barycenter
Dilation
Fractal Geometry
Perimeter
Cone