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chisunch1
GeoGebra
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常见四边形是否是双心四边形
【案例】2018年全国1卷理科12题
垂直線的斜率
平行線的斜率
【案例】2013年安徽高考15题
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推移畢氏
厘米和毫米
example1 star
奈格爾點
第一組-垂心
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Ratios
Parametric Curves
Real Numbers
Arithmetic
Fractions