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分數加減
Author:
iedc
GeoGebra
New Resources
找出對稱軸
四邊形的特性
球体的体积推导（优化版）
拼砌四邊形
判斷球體
Discover Resources
三角形的分割與組合(2)
尋找三角形的內切圓
ex 6
弗雷澤螺旋幻覺圖(難度99%)
八邊形碎形
Discover Topics
Linear Regression
Mode
Pyramid
Sequences and Series
Translation