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九點圓
Author:
Wu Xiao-Ren
三角形的三中點，三垂足，三頂點到垂心中點共圓
GeoGebra
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兩位數加法
判斷球體
兩位數除以一位數（一）
異分母分數減法
【案例】2013年安徽高考15题
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HW 1
相似三角形
p05 eqidistant from two lines
US Unemployment 200701~201707
圆面积展开图--教学材料
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Straight Lines
Parallelogram
Median Line
Median Value
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