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等腰，角度关系
Author:
pjcfs
GeoGebra
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拼砌四邊形
【案例】2013年安徽高考15题
三位數除以一位數（二）
兩組對邊相等和有直角的四邊形
畫出對稱圖形
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七巧板兔子12月坊
二次函数的条件最值
GGB動畫-會有圖案
semops_柱體
塗色練習
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Quadrilaterals
Pyramid
Correlation
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General Quadrilateral