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sinmei5
GeoGebra
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異分母分數減法
四邉形 (四年級) 教師版
四邊形的特性
球體建築師
兩組對邊相等和有直角的四邊形
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正四面體
earth
斯坦納-雷米歐司(Steiner-Lehmus)定理證明三
中線定理(阿波羅尼奧斯)定理推廣一:斯圖爾(Stewart)定理
太陽系的認識(問答)
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Boxplot
Centroid or Barycenter
Rectangle
Mode
Equilateral Triangles