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Tangent perpendicular to radius
Author:
Big Lee
GeoGebra
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三位數除以一位數（一）
兩組對邊相等和有直角的四邊形
【案例】2013年安徽高考15题
判斷球體
異分母分數減法
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正方形和長方形有甚麼特性？
soccer(final)
Question of the shelter
兩位數除兩位數(例子二)
自动变大标签模板
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Line Segment
Upper and Lower Sum or Riemann Sum
Frequency Distribution
Means
Arithmetic Mean