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三垂線定理
Author:
詠甯
GeoGebra
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【案例】2013年安徽高考15题
兩組對邊相等的四邊形
畫出對稱圖形
兩位數加法
兩位數除以一位數（二）
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Quiz on Addition and Subtraction of Directed Numbers (1) 有向數加減測驗(1)
(006)80201辛宇婕
弓形的滚动
中职数学
活工(三)Q1
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Secant Line or Secant
Median Value
Rotation
Hypothesis Testing
Statistics