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高尔顿钉板
Author:
john arnold
GeoGebra
New Resources
【案例】圆柱体内放置一个大球六个小球
斜率的值
三位數除以一位數（二）
漂亮的摇摆曲线
兩位數加法
Discover Resources
孔明棋
justin sin
賺賠：例2的副本
交錯級數(Roger B. Nelsen)
椭圆的离心率
Discover Topics
Integers
Sequences and Series
Arithmetic Operations
Optimization Problems
Parabola