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Orthocentre

Author:Big Lee

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sanjiaohanshu
【案例】2018年全国1卷理科12题
直角坐標平面上的旋轉變換
找出對稱軸
兩組對邊相等和有直角的四邊形

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lower sum for x^2
Geogebra第二個作業,滾動的球-內擺線
拋物線3-平行四邊形法
圆锥曲线1
任意三棱锥的外接球

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Equilateral Triangles
Continuity
Linear Equations
Rhombus
Limits

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