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6．勾股树
Author:
张荣良
GeoGebra
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兩組對邊相等和有直角的四邊形
四邊形的特性
兩組對邊相等的四邊形
異分母分數減法
三位數除以一位數（一）
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正七邊形2
貝茲曲線
畢氏定理
Newton's method
單點透視法
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Algebra
Derivative
Division
Polygons
Parallelogram