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hou yi ting
孢落限
GeoGebra
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兩位數除以一位數（一）
柱體建築師
異分母分數減法
【案例】2013年安徽高考15题
兩組對邊相等的四邊形
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正方形和長方形有甚麼特性？
Homework4
Geometry: Types of Angles 2 (幾何：角的種類 2)
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正十二面體內接正四面體或內接正六面體
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Random Variables
Translation
Variance
Fractal Geometry
Logarithmic Functions