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北斗七星找北極星
Author:
黃義凱
GeoGebra
New Resources
找出對稱軸
兩組對邊相等和有直角的四邊形
異分母分數減法
兩位數除以一位數（二）
球体的体积推导（优化版）
Discover Resources
抛物线的参数方程
九點圓
轨迹
真分數乘以真分數
大小相同串珠
Discover Topics
Symmetry
Sphere
Surface
Variance
Quadrilaterals