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自學材料_巧算圖形的周界活動-沒有答案
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lkkbmaths teachers
GeoGebra
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画直线等分三角形的面积
柱體建築師
兩組對邊相等和有直角的四邊形
畫出對稱圖形
兩位數除以一位數（二）
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三视图
切線段等長
圖H
trigonometry3
如何平移逼近三点的抛物线
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Confidence Interval
Vectors
Integral Calculus
Combinatorics
Secant Line or Secant