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三角形内角和交互课件
Author:
BG
GeoGebra
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直線的斜率
平行線的斜率
圓的切線方程
球体的体积推导（优化版）
兩位數加法
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這是我的答案
Compound Inequalities
切割柏拉圖多面體
Copy of 方格紙上畫長方形2
IF指令定義域與值域範圍的限定
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Indefinite Integral
Probability
Surface
Vectors
Intersection