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周子翔 畢氏定理--2
Author:
郭亮偉
GeoGebra
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拼砌四邊形
兩位數加法
兩組對邊相等的四邊形
兩組對邊相等和有直角的四邊形
【案例】圆柱体内放置一个大球六个小球
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七巧板兔子12月坊
奠基活動20141008
小学数学
错觉多边形
直方圖_Demo的副本
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Distributions
Square
Isosceles Triangles
Symmetry
Trapezoid