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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（二）
柱體建築師
兩組對邊相等的四邊形
錐體建築師
拼砌四邊形
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Helicoid
等腰直角三角形
Rotation
立方体的11种展开图
圖5(動能分析)
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Random Experiments
Linear Equations
Similar Triangles
Subtraction
Piecewise Functions