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正9邊形
Author:
李春培
正9邊形
GeoGebra
New Resources
【案例】圆柱体内放置一个大球六个小球
異分母分數減法
四邊形的特性
三位數除以一位數（二）
判斷球體
Discover Resources
鏡射
積分求面積
Circle
S4 Quadratic Function
翰林數學_2下_CH3-4_扣條
Discover Topics
Rectangle
Congruence
Kite
General Quadrilateral
Plane Figures or Shapes