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椭圆的定义

Author:guomenglin

New Resources

錐體建築師
sanjiaohanshu
拼砌四邊形
兩組對邊相等的四邊形
柱體建築師

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task 7
行進波
平行四邊形
拋物線：切線與弦中點
拋物線的開口、對稱軸、頂點

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Pythagoras or Pythagorean Theorem
Differential Equation
Solids or 3D Shapes
Kite
Algebra

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