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z=sin(sqrt(x^2+y^2))
Author:
MathChou
GeoGebra
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画直线等分三角形的面积
兩位數除以一位數（二）
錐體建築師
判斷球體
異分母分數減法
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Normal dist. (常態分布互動ggb)
Quiz on Centres of Triangles 三角形的中心：測驗
test1
congruent (SSA,RHS)
四角柱體（長方體）的截面
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Diagrams
Standard Deviation
Similarity Transformation or Similarity
Congruence
Ratios