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过圆上一点作切线，三步
Author:
u.jianwang
GeoGebra
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球體建築師
兩組對邊相等和有直角的四邊形
錐體建築師
三位數除以一位數（一）
算柱 (兩位數)
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lim sin(x)/x = 1
cosine graph 變換
人教版必修1函数的表示方法P20例4
二進位翻牌
七年级数学平行线间的橡皮筋问题
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Equations
Exponent
Solids or 3D Shapes
Integral Calculus
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