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橢圓的定義（by Jutor）
Author:
JutorMath
GeoGebra
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畫出對稱圖形
兩位數除以一位數（二）
四邊形的特性
判斷球體
球體建築師
Discover Resources
Apollonius Problem 10 CCC wiki step 4
畢氏定理
仙后座找北極星1
銳角三角：sin, cos
Slope of a tangent 切線斜率
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Sphere
Symmetry
Diagrams
Area
Inequalities