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二次函數（第三階段）
Author:
宋宥輯
GeoGebra
New Resources
找出對稱軸
異分母分數減法
兩位數除以一位數（二）
球體建築師
算柱 (兩位數)
Discover Resources
雙曲線
三垂線
跑馬燈
test
瓜豆原理——动点跟随
Discover Topics
Real Numbers
Variance
Square
Differential Equation
Reflection