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梯形堆垛
Author:
施奕瑄
GeoGebra
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異分母分數減法
三位數除以一位數（一）
兩組對邊相等的四邊形
sanjiaohanshu
兩組對邊相等和有直角的四邊形
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等分例子
相同圖形的拼砌（有兩組平行線的四邊形）
三角形
group m
畫三角形 第3題
Discover Topics
Derivative
Circumcircle or Circumscribed Circle
Triangles
Incircle or Inscribed Circle
Variance