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Geometric Meaning of Derivatives
Author:
赵清河
GeoGebra
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錐體建築師
兩組對邊相等和有直角的四邊形
三位數除以一位數（二）
拼砌四邊形
畫出對稱圖形
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折扣 例5
九點圓
軌跡,摺紙,滾動,實驗觀察,曲線
三角形的內角、外角、內角和與外角和
線性規劃
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Pyramid
Subtraction
Parabola
Statistics
Intersection