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huang910316
GeoGebra
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異分母分數減法
算柱 (兩位數)
小数 的副本
近似值：有效數字
畫出對稱圖形
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呵呵
正八面體
簡單動畫
畫三角形 題1b 的複本
连杆
Discover Topics
Piecewise Functions
Tangent Function
Cosine
Means
Confidence Interval