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Triangular Number 三角形數
Author:
Alex CHIK
GeoGebra
GeoGebra 互動數學教室
http://www.geogebra.hk
New Resources
GeoGebra笔记功能体验课件
四邊形的特性
【案例】2018年全国1卷理科12题
兩位數除以一位數（二）
兩組對邊相等和有直角的四邊形
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eye tracing
密鋪5
颱風暴風圈
方程式(?)
三圓外切
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Ellipse
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