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Author:
Ching-Hui Chou
GeoGebra
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畫出對稱圖形
四邉形 (四年級) 教師版
判斷球體
算柱 (兩位數)
兩位數加法
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三角形的內角和＝180度
三角柱算體積
美麗的花
正方形的邊長和周界
两个等腰三角形
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Quadrilaterals
Fractal Geometry
Optimization Problems
Quadratic Equations
Histogram