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平行四边形的性质探索

Author:蔡永志

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異分母分數減法
拼砌四邊形
近似值：有效數字
兩組對邊相等的四邊形
算柱 (兩位數)

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判斷線型函數y=f(x)=ax+b的b值
簡易統計
拿破崙三角形(費馬點)
簡單動畫
一年級
重难题组周练（1）——二次函数

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Standard Deviation
Volume
Intersection
Centroid or Barycenter
Scatter Plot

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