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过圆上一点作切线，三步
Author:
u.jianwang
GeoGebra
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兩位數除以一位數（一）
四邊形的特性
直角坐標平面上的旋轉變換
畫出對稱圖形
【案例】2018年全国1卷理科12题
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圓錐的截面
三角形的邊長
圆锥的侧面展开图3D
Curtate Cycloid
i love you的副本
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Rhombus
Mode
Variance
Differential Calculus
Derivative