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常见四边形是否是双心四边形

Author:孟宝兴

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兩組對邊相等和有直角的四邊形
判斷球體
兩位數加法
【案例】2018年全国1卷理科12题
拼砌四邊形

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K9@cn
linear function
均分除法（整數÷整數）
congruent (SA) 2
圆周长演示

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Confidence Interval
Rectangle
Rhombus
Set Theory
Poisson Distribution

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