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fchengang
Author:
符成岗
GeoGebra
New Resources
算柱 (兩位數)
四邉形 (四年級) 教師版
画直线等分三角形的面积
錐體建築師
三位數除以一位數（二）
Discover Resources
大樂透開獎機(由小號到大號)
幾何分布 (Geometric Distribution)
gslsj 橫向的三角數列
正弦定理的副本
巧算周界
Discover Topics
Boxplot
Probability
Histogram
Means
Tangent Function