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根據百分率找數量（二）: 例2的副本
Author:
冯圣军
,
GeoGebra Institute of Hong Kong
GeoGebra
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直角坐標平面上的旋轉變換
近似值：有效數字
判斷球體
三位數除以一位數（二）
GeoGebra笔记功能体验课件
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美麗的彩虹骨牌
數值滑桿
三角比一
日光平行光
對鄰邊之對
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