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高尔顿钉板
Author:
john arnold
GeoGebra
New Resources
球体的体积推导（优化版）
兩位數加法
拼砌四邊形
異分母分數減法
【案例】2013年安徽高考15题
Discover Resources
Sequence指令練習(包絡線：橢圓)
異分母分數加法
標準分解式2
一线三等角模型
Estimating the Mean
Discover Topics
Exponent
Continuity
Cone
Area
Straight Lines