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Problem1:(md+me+mf)/(ad+be+cf)=a
Author:
vinnyya
GeoGebra
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兩組對邊相等的四邊形
判斷球體
【案例】2013年安徽高考15题
兩位數除以一位數（一）
兩組對邊相等和有直角的四邊形
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Apollonius Problem 4 LLP Homo 12
指数和幂增长
gjc091b18 圓的割線
兩圓外公切線
MFS: Rebound 1
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Real Numbers
Straight Lines
Continuity
Vectors
Hypergeometric Distribution