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waaachen
Author:
陳兪宏
梯形+二次函數
GeoGebra
New Resources
找出對稱軸
錐體建築師
拼砌四邊形
兩位數除以一位數（二）
三位數除以一位數（二）
Discover Resources
題九
堆垛六顆橘子
內擺線
弦的垂直線何時平分弦活動?
三角形综合题
Discover Topics
Incircle or Inscribed Circle
Quadratic Functions
Mathematics
General Quadrilateral
Quadrilaterals