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http://www.qsir.org/?p=8853
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GeoGebra
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兩位數加法
三位數除以一位數（一）
兩位數除以一位數（二）
異分母分數減法
拼砌四邊形
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多邊形
HHHH
長方形
s1118931
圆周展开
Discover Topics
Plane Figures or Shapes
Cone
Congruence
Statistical Characteristics
Circle