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椭圆的定义

Author:guomenglin

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兩位數除以一位數（二）
兩位數加法
拼砌四邊形
錐體建築師
柱體建築師

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GeoGebra Tube
正弦公式1
纏繞畫
放缩尺
全等双子模型（等腰三角形）

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Rotation
Pythagoras or Pythagorean Theorem
Scalene Triangles
Kite
Linear Equations

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