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XY07 星軌轉多久？
Author:
学用数学
GeoGebra
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兩組對邊相等和有直角的四邊形
兩組對邊相等的四邊形
兩位數加法
拼砌四邊形
柱體建築師
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題 4
習作A三ch1_11
斜坐標
和两个圆都相切的圆
時距計算機 (時針改變)
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Rational Numbers
Variance
Congruence
Natural Numbers
Plane Figures or Shapes