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椭圆的定义

Author:guomenglin

New Resources

畫出對稱圖形
判斷球體
兩位數除以一位數（二）
兩組對邊相等和有直角的四邊形
兩位數加法

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圓周
trigo ratios np2c
圖D
circle
旋转的线段组成面

Discover Topics

LCM and GCD
Linear Equations
Upper and Lower Sum or Riemann Sum
Bar Chart or Bar Graph
Circumcircle or Circumscribed Circle

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