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Author:
树常青
GeoGebra
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第八周作业
兩位數除以一位數（一）
三位數除以一位數（二）
拼砌四邊形
錐體建築師
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Reflectional symmetry of Triangular prism
三角形ㄛ
reflection points
橢圓P176例11
初中数学
Discover Topics
Ellipse
Standard Deviation
Probability
Secant Line or Secant
Geometric Distribution