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20200108中线倍长大法

Author:陈敦莹

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兩組對邊相等的四邊形
sanjiaohanshu
兩組對邊相等和有直角的四邊形
拼砌四邊形
近似值：有效數字

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上和與下和
對稱圖形
分數乘法的副本
mathmedia_40204
七年级数学平行线间的橡皮筋问题

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Secant Line or Secant
Geometry
Fractions
Straight Lines
Statistical Characteristics

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