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空間中兩向量夾角
Author:
羅驥韡 (Pegasus Roe)
GeoGebra
New Resources
異分母分數減法
柱體建築師
直角坐標平面上的旋轉變換
算柱 (兩位數)
兩組對邊相等和有直角的四邊形
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[問題] a² + b² = 1, (c-4)² + (d-2)² = 5，求 ad - bc 最大值？
IMO2015D
ex 4
學習活動二之二參數與圖形結構的關係
橢圓(左右型)標準式
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Area
Circumcircle or Circumscribed Circle
Planes
Secant Line or Secant
Rectangle