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五上:三角形的面积公式推导、三角形的底和高
Author:
钟秀群
,
Anthony OR 柯志明
Topic:
Area
,
Triangles
三角形的面積
GeoGebra
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柯志明 香港 GeoGebra 學院
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Fibonacci Clock
畫出對稱圖形
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近似值:有效數字
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立體幾何
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捷徑
sincos
繡曲線02
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Pie Chart or Circle Chart
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