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试验次数与频率的关系（投掷一枚硬币）
Author:
Zhang Guangmin
Topic:
Probability
GeoGebra
New Resources
三位數除以一位數（二）
兩組對邊相等和有直角的四邊形
判斷球體
球體建築師
算柱 (兩位數)
Discover Resources
均分
二次函数的值
多項式函數
金剛合體！！
matrix of rotation transformation
Discover Topics
Coordinates
Piecewise Functions
Dilation
Set Theory
Linear Programming or Linear Optimization