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23平行线周长正方形
Author:
万超杰
GeoGebra
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三位數除以一位數（一）
拼砌四邊形
四邊形的特性
畫出對稱圖形
三位數除以一位數（二）
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奠基活動20141008
歐拉圓
-3/2 ≤ cosα + cosβ + cosγ ≤ 3
Quiz on Signs of Coefficients of Quadratic Functions 二次函數係數的正負號：測驗
数矩形个数
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Normal Distribution
Translation
Upper and Lower Sum or Riemann Sum
Parabola
Vectors