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橢圓之極偶 / polarity for ellipse
Author:
XIE Yuheng
GeoGebra
New Resources
兩位數加法
兩位數除以一位數（一）
錐體建築師
判斷球體
sanjiaohanshu
Discover Resources
推移（x 方向）
柱體建築師 2
分年細目：7-a-12 能在直角坐標平面上描繪常數函數及一次函數的圖形。
翰林B4習p85_10
垂心應用
Discover Topics
Real Numbers
Fractions
Congruence
Arithmetic Operations
Exponential Functions