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Author:
李俊峰
GeoGebra
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兩位數除以一位數(一)
異分母分數減法
四邉形 (四年級) 教師版
球體建築師
找出對稱軸
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三角形的內角和=180度
二項分布 (黑板)
圖形周界_H
圓錐曲線的光學性質
谢尔宾斯基三角形
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Fractions
Upper and Lower Sum or Riemann Sum
Linear Equations
Similar Triangles