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12面體
Author:
蕭富偉
GeoGebra
New Resources
球體建築師
畫出對稱圖形
異分母分數減法
找出對稱軸
三位數除以一位數（二）
Discover Resources
來畫雙曲線
圓錐曲線的線性變換
選擇合適的「中間人」
托勒密定理推廣到直線
橢圓3--平行四邊形法
Discover Topics
Numbers
Trigonometry
Planes
LCM and GCD
Triangles