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分數減法
Author:
iedc
GeoGebra
New Resources
四邊形的特性
兩組對邊相等的四邊形
拼砌四邊形
球体的体积推导（优化版）
兩組對邊相等和有直角的四邊形
Discover Resources
Quiz on Quadratic Formula 二次公式：測驗
Vector equation in R2
蛇形排数
夹逼法确定无理数根号2的范围
两个等腰三角形
Discover Topics
Geometric Transformations
Cube
Perimeter
Kite
Linear Regression