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quadrilaterals 4
Author:
iedc
GeoGebra
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畫出對稱圖形
三位數除以一位數（二）
找出對稱軸
GeoGebra笔记功能体验课件
兩位數除以一位數（二）
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圆的面积展开
Apollonius Problem 7 CCP Inversion simple 34
Gazing Cow Problem (a)
拋物線4--平行四邊形法
椭球面
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Combinatorics
Functions
Intersection
Division
Pythagoras or Pythagorean Theorem