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Introduction of pH
Author:
Alex CHIK
GeoGebra
http://www.geogebra.hk
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畫出對稱圖形
錐體建築師
拼砌四邊形
近似值：有效數字
兩組對邊相等和有直角的四邊形
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task2
三角形的內角、外角、內角和與外角和
Angle between 2 planes in a cube
分段2
在数轴上表示根号数-表格区
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Translation
Volume
Expected Value
Numbers
Plane Figures or Shapes