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happy birthday
Author:
李春培
happy birthday
GeoGebra
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小数 的副本
異分母分數減法
判斷球體
畫出對稱圖形
柱體建築師
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圖騰 DEMO
圓外切及內切
分數比較
四邊形ADFE的面積是多少？
直線的斜率：水平變化 & 鉛垂變化
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Coordinates
Tangent Line or Tangent
Standard Deviation
Means
Root