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正九邊形
Author:
李春培
正九邊形
GeoGebra
New Resources
兩位數除以一位數（二）
異分母分數減法
拼砌四邊形
球體建築師
兩組對邊相等和有直角的四邊形
Discover Resources
牟合方蓋：兩圓柱交集
chuan-eBook
五上複合圖形的面積
函数作图工具的副本
输入任意函数得到其多项式逼近函数
Discover Topics
Linear Functions
Cuboid
Geometric Mean
Vectors 2D (Two-Dimensional)
Logic