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qr code for symmetry
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lkkbmaths teachers
qr code for symmetry
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判斷球體
找出對稱軸
錐體建築師
球体的体积推导（优化版）
球體建築師
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優良作品2(祥恩)
中垂線性質
投擲兩枚硬幣的概率
拋物線6--包絡線法
轨迹最值功底测第8题
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Probability
Median Line
Conditional Probability
Circle
Triangles
