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Addition of 2 Directed Numbers
Author:
Chan Man Fai
Addition of 2 directed numbers
GeoGebra
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球体的体积推导（优化版）
算柱 (兩位數)
四邊形的特性
兩位數除以一位數（一）
兩組對邊相等和有直角的四邊形
Discover Resources
test
mooc第四讲作业单晨
基础知识
频率与概率——投掷硬币的试验
Copia de Fractal Spirograph (Fractal Roulette)
Discover Topics
Probability
Integers
Circle
Intersection
Poisson Distribution