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Author:
yuchengda
GeoGebra
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兩位數除以一位數（一）
兩組對邊相等的四邊形
球體建築師
拼砌四邊形
画直线等分三角形的面积
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斜射光三角量測
Angle at Centre
Christmas Tree
模擬分洪堰曲線方程式
quiz 9.1 1(d)
Discover Topics
Logic
Sphere
Rational Numbers
Quadratic Equations
Centroid or Barycenter