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Author:
bigbirdjack
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三位數除以一位數（二）
讀磅
画直线等分三角形的面积
平行線的斜率
兩位數加法
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Venn diagram
扇形弧長公式1
線的面化
多边形旋
（三）观察物体
Discover Topics
Ellipse
Cylinder
Geometric Mean
Upper and Lower Sum or Riemann Sum
Vectors 3D (Three-Dimensional)