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固定周界的長方形的面積變化（周界是200厘米）
Author:
李寶玲
,
GeoGebra Institute of Hong Kong
GeoGebra
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拼砌四邊形
湖南省张毅郴数字教研工作室 logo
判斷球體
畫出對稱圖形
Earth with coastline
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