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parallelogram
Author:
iedc
GeoGebra
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四邊形的特性
Nested spiral octagon
算柱 (兩位數)
直角坐標平面上的旋轉變換
小数 的副本
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旋轉動畫
圓內接四邊形任務二：提示一
圓心角
百分數與分數
连续开方（制作：谢建华，修订：孟宝兴）
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Intersection
Sphere
Interest Calculation
Expected Value
Exponent