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椭圆的定义
Author:
guomenglin
Topic:
Ellipse
GeoGebra
New Resources
兩位數除以一位數（二）
四邉形 (四年級) 教師版
兩位數除以一位數（一）
第八周作业
算柱 (兩位數)
Discover Resources
反射對稱
平行四邊形的面積
Drag the red dots, see the area ratio of EHFG to ABCD
圓周
特殊角三角函数值
Discover Topics
Centroid or Barycenter
Rational Numbers
Exponent
Tangent Line or Tangent
Orthocenter