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Author:
杜耀宗
GeoGebra
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兩位數加法
異分母分數減法
三位數除以一位數（一）
画直线等分三角形的面积
錐體建築師
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彰師大巧思館0531
最佳解
用圓作成的三角形
mooc第四讲椭圆反射
橢圓3--平行四邊形法
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Stochastic Process or Random Process
Logarithm
Intersection
Set Theory
Scalene Triangles