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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
兩組對邊相等和有直角的四邊形
三位數除以一位數（二）
異分母分數減法
判斷球體
四邊形的特性
Discover Resources
Locus (Two points 1)
(001)80201辛宇婕
密鋪2
Copy of 平行四邊形的面積
第二組-費馬點
Discover Topics
Volume
Piecewise Functions
Mode
Natural Numbers
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